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Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ink-paper historical documents, which are an important part of cultural heritage, can be damaged by various materials on the outside and the inside of the paper. Cotton fiber sheets treated with iron gall ink and then treated with stabilization materials were studied. Nanosized Mg(OH)2 was used as a deacidification material and potassium bromide, tetrabutylammonium bromide, or propyl gallate as antioxidant materials were investigated as a stabilization system for iron gall ink-damaged paper. All samples were artificially aged in the air for 150 h at 65 °C in a UV/moisture chamber or 500 h at 90 °C. The pH and alkaline reserve (AR) measurements, monitoring of color change, and scanning electron microscopy analysis data confirm that the aging effect is more destructive to the iron gall inked paper. The experiment results show that using alkaline materials with antioxidants, such as nano-Mg(OH)2 and propyl gallate, positively affects color changes of ink-damaged paper. Treatment with a stabilization system such as nanosized Mg(OH)2, a binder hydroxypropyl cellulose (Klucel), and an antioxidant as propyl gallate is a suitable method for iron gall ink damaged paper stabilization and preservation, according to the study results. [ABSTRACT FROM AUTHOR]

Xuan paper is one of the most famous handmade papers in China and is an important paper for conservation. However, the evenness of Xuan paper has not yet received much attention. In this study, the distribution of the in-plane grammage and mechanical properties of Xuan paper are measured. It is found that the distribution of the in-plane grammage and mechanical properties of Xuan paper is uneven. In the handmade direction, the grammage and mechanical properties of Xuan paper are overall largest in the lower area, followed by the upper and middle areas. The sheet forming process of Xuan paper has an important effect on the distribution of in-plane grammage, mechanical properties, and fiber orientation of Xuan paper. The folded state has a negative effect on the mechanical properties of the folded area of Xuan paper. This study will help raise awareness of the unevenness in physical properties of Xuan paper, which is important in both conservation and research applications. [ABSTRACT FROM AUTHOR]

To understand the degradation behaviour of rolled hanging scrolls for future conservation treatments, we evaluated the degradation–position profiles of naturally aged hanging scrolls and their model samples, which were subjected to different storage conditions. For the sample immersed in a CuSO4・5H2O solution and rolled around a glass rod, accelerated ageing using the open method (80°C, 65% RH) revealed a tendency of lower pH and higher discolouration towards the central positions, where rolling caused the most tightness. However, no clear tendencies were observed for the concentration variations of organic acids. The degradation effects of the organic acids emitted from the paulownia wooden box were also examined using the sealed tube method by enclosing the rolled painting paper and acidic paper containing organic acids together in a glass tube. Large amounts of oxalic and formic acids were detected at the periphery and scant migration of the organic acids was observed towards the centre, thus indicating that the central positions of the painting paper were less susceptible to the influence of the organic acids emitted from the external environment. By contrast, glycolic acid diffused towards the centre. The analysis of two naturally aged hanging scrolls showed different degradation behaviours. One sample, stored open in the rolled state, showed severe discolouration with the naked eye at the outermost back surface of the scroll. This was possibly associated with the large amount of sulfate ions originating from the external atmosphere, which kept the pH lower and increased discolouration towards the peripheral positions of the painting paper. For the sample stored in a paulownia wooden box, discolouration was not observed with the naked eye at the outermost back surface of the scroll, although lower pH and higher discolouration were observed towards the central positions. [ABSTRACT FROM AUTHOR]

One of the factors affecting the life expectancy of hanging scrolls is the storage environment. Our study focused on clarifying the degradation behaviour of painting paper, concentrating on the specific storage conditions that provide an airtight environment in a storage box and the stacked structure of the rolled paper rather than considering the materials of the wooden storage box or the gases generated from it. The degradation behaviour and rates for the sealed tube and moist heat ageing methods, excluding the additional effects of light and air pollutants, were compared. When the painting paper was immersed in a CuSO4・5H2O solution instead of a copper green pigment, the oxidation of the painting paper, attributed to Cu2+, proceeded faster with the sealed tube method than with the moist heat method. The co-occurring organic acids generated, namely glycolic and formic acids, which were secondary components, were detected in a higher amount in the first lining paper than the painting paper. This implies that the acids migrated from the painting paper into the lining paper. However, oxalic acid, which was the main component, did not significantly migrate and remained in the reaction system in the sealed tube without volatilising. This increased the hydrogen ion concentration in the painting paper and accelerated acid hydrolysis. Consequently, discolouration and a decrease in the degree of polymerisation and physical strength proceeded faster with the sealed tube method than with the moist heat method. Thus, although this result does not necessarily invalidate the storage system of a rolled hanging scroll in a box, the storage of a deteriorated hanging scroll in a closed system is expected to degrade the painting paper faster than it would in an open system. [ABSTRACT FROM AUTHOR]

A Japanese painting paper is sized with an aqueous solution of alum and animal glue followed by brushing with a mixture of pigments of various colours and aqueous animal glue solution. Subsequently, to mount the Japanese painting to a hanging scroll, the backside of the painting is lined with a first lining paper using wheat starch paste for mechanical support. To evaluate the permanence of the painting paper as a composite material in the hanging scroll, the deterioration behaviour of the unlined painting paper and the lined painting paper was compared considering the material dynamics. After moist heat accelerated ageing (80°C, 65% RH), in the sample immersed in a CuSO4・5H2O solution, cellulose was oxidised by Cu2+ to generate organic acids in the painting paper, and Cu2+ and organic acids migrated to the lining paper. Consequently, the discolouration and oxidation of the painting paper in the lined complex were relatively low compared with those of the unlined painting paper. The pH decrease in the painting paper was also small in the lined complex. Moreover, if the animal glue solution was coated on the painting paper, a buffer effect was shown to operate against the organic acids derived from the oxidation of Cu2+, thereby inhibiting the migration of Cu2+ into the lining paper. In conclusion, the presence of the lining paper inhibited the decrease in the physical strength and degree of polymerisation of the cellulose in the painting paper, thus contributing to its permanence in the lined hanging scroll. [ABSTRACT FROM AUTHOR]

To study the life expectancy and difference in aging resistance properties of different modern repair bamboo papers, hydrothermal/dry-heat ageing experiments on repair bamboo paper samples were conducted. The mechanical strength (tensile strength and folding endurance) of different papers during the ageing process were analyzed. Furthermore, the chemical properties (degree of polymerization and pH) of the samples were tested to search for the immanent cause of paper ageing. The results indicated that the ageing resistance ability and durability of modern repair paper are strongly related to their production process, which corresponds with the initial properties of the paper. Mechanical pulp had a low degradation resistance, which was further exacerbated by the chemical bleaching process. In the long run, traditional handmade papers with solar bleaching processes will have longer-term stability and durability. [ABSTRACT FROM AUTHOR]

Among bleaching agents available in paper conservation, hydrogen peroxide (HP) is a versatile choice that has many advantages in the removal of discoloration from paper. However, its well-known radical formation in the presence of iron impurities in paper poses the risk of cellulose degradation and color reversion, i.e. return of staining. This study explores a method to diminish undesired HP reactions by adding an additional step using a calcium phytate solution as complexing agent to the recommended treatment sequence. Tests on model papers impregnated with different molar concentrations of iron ions to trace the effects of simulated HP treatments on weight average molar mass, carbonyl group content, and color indicate that the iron phytate complex is sufficiently stable to sustain limited HP bleaching and thereby keeps the iron ions to a certain extent from the reaction system. [ABSTRACT FROM AUTHOR]

This paper proposes the use of simulation modelling to explore the effect of conservation strategies on the preservation of paper collections. Agent-based simulation was chosen as the simulation approach in order to capture the individual characteristics of the collections, their size, and the values of pH and degree of polymerisation (DP) for individual items. This approach enabled the simulation of the chemical degradation of different types of collections during their lifetime and under different preservation scenarios. We conducted a series of computational experiments on three types of collections, acidic, modern, and mixed, to explore the effect of slightly lowering the temperature and relative humidity in the repositories, the deacidification of part of the collection at different rates, and the delay in making the decision to start a deacidification treatment. The results indicated that a small change, lowering the storage conditions from 18°C to 16°C and from 50% to 40% RH, can protect up to 30% of the collection from reaching the critical DP of 300 within a time horizon of 500 years. On the other hand, to obtain similar results through deacidification, 45% of the mixed collection and 70% of the acidic collection should be deacidified within a period of 100 years. The experiments also indicated that better results are obtained when the priorities for deacidification are acidic records with a pH value below 5. This study shows that modelling the heterogeneity of the collections can support preservation management, particularly if the concern is not the preservation of a part of the collection but the collection as a whole. [ABSTRACT FROM AUTHOR]

The National Museum in Krakow, Poland, has been carrying out a comprehensive risk assessment for its extensive collections of works on paper. The collection was stratified into primary homogeneous groups such as holdings of works by important artists or large groups of documentary prints or posters. Relative values of the selected groups of objects were estimated based on their market values. The primary groups of objects were further divided into subgroups for different risk scenarios developed by considering varying susceptibility of the subgroups to two key hazards - chemical deterioration and physical failure upon handling. A number of criteria were used: paper brittleness, pH, or the degree of protection of objects against physical forces through containment options defined as framed, matted, contained in albums, or unprotected. Next, the accumulation of damage from the deterioration processes or multiple events for each subgroup of the specific risk scenario was estimated. Finally, the loss of value was assessed by museum staff by considering questions as to how the predicted damage accumulation affects the uniqueness of the work, its artistic value, documentary information, or display potential. The information collected at all stages was introduced into a specifically developed software tool which calculated and presented the magnitudes of risks facilitating the risk evaluation. [ABSTRACT FROM AUTHOR]

The gellan hydrogel is used as a cleaning agent for paper artworks. The purposes of this work were to give the gellan hydrogel both a microbial resistance and a cytocidal action against the biodeteriogens using hydrolates. Broth microdilution assays were performed to identify the fungicidal action of 16 hydrolatesvs3 fungal strains. The study concerned the Minimal Fungicidal Concentration and pH, colour, and ultra-structural variations on all paper samples, by placing them in contact with GELYD (GELlan + hYDrolat). Thein vitrotests showed that eight out of 16 hydrolates strongly inhibited fungal growth, but only two of them (Monarda fistulosa,Citrus aurantiumsubspamara) showedin situfungicidal action. Data indicate a new and interesting eco-innovative use of hydrolates, since GELYD is able not only to clean paper artworks, but also to kill the fungal cells present on paper that are potentially harmful for paper and operators. [ABSTRACT FROM AUTHOR]

Despite substantial literature on the dyeing of textiles, there is a lack of research about colouring Japanese mending papers (tissue papers) used for paper conservation purposes. This study investigates the fungal bioreceptivity of Japanese tissue papers after they have been treated with various dyes and pigments. A variety of toning materials including plant dyes, watercolours, acrylic paints, inks, pastels, gouaches, and colour pencils are commonly used by conservators for paper toning purposes. In this study, two Japanese tissue papers (Yukyu-shiandSekishu Mare) were treated with selected plant dyes, watercolours, and acrylic paints and then inoculated with fungal species. Quantitative real-time polymerase chain reaction (qPCR) was used to quantify the DNA fromAspergillus nigerandPenicillium rubrumas a proxy for fungal species abundance before and after inoculation and artificial moist heat ageing. qPCR primers which were universal for fungi amplified DNA from papers inoculated withA. nigerandP. rubrumand these species were found to grow less on treatedSekishu MareandYukyu-shipapers compared with untreated papers.Sekishu Marepapers treated with artists' acrylic paints were found to be more resistant to fungal growth than similarly treatedYukyu-shipapers. This study suggests that for the best long-term preservation outcomes for paper materials in archives, libraries, galleries, and museums, acrylic paints generally perform better in conservation terms than most plant dyes and watercolours, although most colourants displayed some bioinhibition. [ABSTRACT FROM PUBLISHER]

In paper conservation ethanol is used as an antifungal agent. However, information on the antifungal efficacy of this alcohol is scarce and often inconsistent. In this study, we clarify if ethanol is effective and safe to use in paper conservation in the short as well as in the long term. None of the tested ethanol concentrations (5–100%) promoted conidia germination, but rather delayed or entirely inhibited it, depending on alcohol concentration and contact time. In a simulation of an interventive treatment of samples colonized by fungi, all the tested ethanolic solutions (30, 70, and 100%) revealed antifungal activity. The best results were obtained with 70% ethanol, showing fungicidal properties on four of the five-tested fungal species (Aspergillus niger,Cladosporium cladosporioides,Penicillium chrysogenum, andPenicillium corylophilum). No deleterious effects of 70% ethanol on the tested paper were observed either in the short or in the long term. [ABSTRACT FROM PUBLISHER]

This paper describes and illustrates an innovative technique for compensation of small losses to East Asian lacquer and inlaid mother-of-pearl decoration using paper fills painted and glazedin situ. The procedure involves tracing the loss on Mylar®polyester sheet, cutting Japanese tissue paper to the size and shape of the loss, and adhering the paper fill to the surface. The paper fill is then paintedin situto integrate it with the surrounding surface decoration and glazed with a transparent medium, which is cured under silicone-coated Mylar®to match the planarity and gloss of the surrounding surface. This basic procedure can be adapted to suit the needs and solvent sensitivities of individual objects. The technique offers the ability to preserve or adjust old fills and to match an irregular surface or surface decoration. It is easily reversible and gives the final surface a semi-translucent appearance. Moderate surface stability and solvent resistance in the surrounding lacquer are necessary for the technique. The case studies presented in this paper demonstrate that the technique yields good results and is a useful addition to the arsenal of options for lacquer compensation. [ABSTRACT FROM PUBLISHER]

A systematic experimental study applying nanosecond laser pulses with 532 nm radiation to a specially selected set of historical paper samples exhibiting a broad range of composition and origin was undertaken to develop a quantitative irradiation dose model. This allows the optimisation of laser pulse number and fluence in order to maximise cleaning efficiency while excluding substrate modifications such as yellowing or destruction. [ABSTRACT FROM AUTHOR]

The National Museum in Krakow, Poland, has been carrying out a comprehensive risk assessment for its extensive collections of works on paper. The collection was stratified into primary homogeneous groups such as holdings of works by important artists or large groups of documentary prints or posters. Relative values of the selected groups of objects were estimated based on their market values. The primary groups of objects were further divided into subgroups for different risk scenarios developed by considering varying susceptibility of the subgroups to two key hazards - chemical deterioration and physical failure upon handling. A number of criteria were used: paper brittleness, pH, or the degree of protection of objects against physical forces through containment options defined as framed, matted, contained in albums, or unprotected. Next, the accumulation of damage from the deterioration processes or multiple events for each subgroup of the specific risk scenario was estimated. Finally, the loss of value was assessed by museum staff by considering questions as to how the predicted damage accumulation affects the uniqueness of the work, its artistic value, documentary information, or display potential. The information collected at all stages was introduced into a specifically developed software tool which calculated and presented the magnitudes of risks facilitating the risk evaluation. [ABSTRACT FROM AUTHOR]

The article discusses the role of paper lining in conservation and mounting of East Asian paintings. Topics include details on the weak materials of paper and silk and their use in paintings, details on the various available methods of paper lining, the role of paper lining in providing support to a painting by reinforcing its silk or paper substrate, details on the different papers used in lining techniques, details on the different adhesives used in lining such as wheat starch paste, and details on Chinese style lining.

Xenophanes is a figurine made of a waxy mixture and grey plasticine, created by Yannis Pappas at the end of the twentieth century. During its short period of existence, the figurine presented severe plastic deformation, structural, and stability issues, with detached or missing elements. The artwork's earlier preserved states are documented by an archival photograph of 1994 and two casts dated to 2005. The physical treatment of its deformation is an irreversible intervention that may put the artwork in additional danger. The conservation of complex contemporary artworks comprises a challenging field of work, as the coexistence and aging of different and often pliable materials lead to multiple deformations. Their conservation treatments could be kept to a minimum for the preservation and understanding of the artworks, with the support of three-dimensional (3D) documentation and digital restoration. A digital restoration that simulates the physical treatment of an artwork aims to provide information that could assist with decisions made for its physical care by minimizing the risks. This paper examines the digital restoration of the small figurine Xenophanes following the steps of increased intervention of a probable physical treatment and how each step of this process may affect its stability. 3D documentation of the current condition of the artwork and its two casts was made utilizing optical laser scanning and structure from motion photogrammetry. The resulting 3D models facilitated the digital restoration of the artwork to its earlier states. The comparison and analysis of the 3D models and the digital restoration process provided information that could assist its physical treatment. The digital restoration of the complex plastic deformation of an artwork is a case that, to our knowledge, has not been addressed so far. The complexity of the progress, the ethical dilemmas that arise during the artwork's restoration, and the reflection on the restoration of a cultural artifact only in the digital environment encourage the rethinking of conservation. [ABSTRACT FROM AUTHOR]

Upon aging, paper documents and books become progressively damaged. Paper deacidification is a fundamental conservation intervention. In this study, we report on the use of nanoparticles of titanium dioxide (TiO2) and magnesium hydroxide (Mg(OH)2) associated with hydroxyethylcellulose (HEC) to inhibit acidification, photo-induced degradation, and biodeterioration of paper. With the aid of ultrasound, Mg(OH)2 nanoparticles with a narrow size distribution can be obtained through homogeneous precipitation in water. Furthermore, to demonstrate the efficacy of the nanocomposite and the performance of treated and untreated paper, photo- and thermal-induced degradation is discussed. The results show that using the controlled double-jet precipitation (CDJP) it is possible to synthesize Mg(OH)2 particles with a narrow size distribution (18-87 nm). The nanocomposite of Mg(OH)2-TiO2-HEC increases the durability of paper by imparting fungal growth resistance (D= 34.6 mm), moderate alkalinity (pH = 8.4), mechanical reinforcement (from 817-896 N/m), and UV protection. Additionally, there is a slight color difference (ΔE* = 0.8) between the treated and untreated paper. Both photodegradation and thermal degradation indicate that the paper treated with this nanocomposite (Mg(OH)2-TiO-HEC) has increased stability. [ABSTRACT FROM AUTHOR]

With the aim of developing a new easy-to-use method for rescuing flood-damaged paper, the effect of saltwater on the inhibition of fungal growth on paper was investigated. This procedure could be used instead of, or assisted by freeze drying. Cellulose-digesting Trichoderma reesei, three types of fungi representative of fungi growing on paper (T. reesei, Aspergillus terreus, and Aureobasidium pullulans) and various naturally airborne fungi were cultured on cellulosic materials in liquid media containing artificial seawater with different salt concentrations. The addition of salts successfully inhibited the growth of T reesei on microcrystalline cellulose at the concentration of 3.2% (m/m) or higher. The critical salt concentration, 3.2%, is within the general range of salt content in seawater. Other solutions of salts similar to sodium chloride also inhibited fungal growth. Although the observed growth-inhibiting effect was attributed to the high osmotic pressure of the salt solution, physiological effects depending on ion species used were also considered to be possible. The growth of all three types of fungi on copy paper was inhibited effectively when the salt concentration was increased. The growth of various fungi on pure cellulose, with enough oxygen supplied to pores, was completely inhibited (as assessed by visual examination) for 24 days at salt concentrations of 3.5% (m/m) or greater. The fact that the effect of saltwater on cellulosic materials was observed even under optimum medium conditions implies that fungi would be considerably inhibited on flood-damaged paper immersed in saltwater. This method is a promising first aid measure when circumstances do not allow for flood-damaged paper to be dried immediately. [ABSTRACT FROM AUTHOR]

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The paper is a review of bibliographical publications relating to transparent papers during the period 1960 to 1999. Emphasis is placed on conservation treatments. An introductory chapter covering the history and technology of these papers is followed by a description of types of degradation frequently encountered and a short paragraph dedicated to analysis. Subsequent chapters discuss conservation treatments, including dry cleaning, humidification and flattening, washing and deacidification, lining, local repairs, resizing, facing, solvent use and bleaching. A discussion of housing and storage methods completes the review. [ABSTRACT FROM AUTHOR]

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article focuses on the use of design of experiment (DoE) approach for photographs and paper works which may get damaged by the environmental changes. It discusses the need for controlling the environmental factors like relative humidity (RH) and temperature, how the research information gathered have made it possible to recommend materials for framing of photographs and paper in museum collection. It also talks about the use of Mavelseal, which can help to reduce the humidity fluctuations with marginal costs.

The article presents an evaluation study for the matting and framing methods along with the materials used for the temporary display and preservation of photographs and other art works on paper. Topics discussed include the need to improve traditional in-house framing practices used for photographs, details of the design of experiment (DoE) used for the overall evaluation and the testing of the photographic frames in microclimate conditions. The article also includes the conclusion derived from the research.

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this work, active infrared thermography was applied to study a seventeenth-century painting on paper, namely the Chigi's family tree, housed at Palazzo Chigi in Ariccia (Rome). Thermography was performed before and after restoration to obtain information used in planning the restoration and also to assess its effectiveness. Infrared thermography provided important information on the artifact structure, areas of damage, structural defects, and the state of adhesion between different layers of the composite artifact before and after the treatment. [ABSTRACT FROM AUTHOR]

This paper describes the findings of a technical study of the materials and techniques used by Honore Daumier for works on canvas, panel and paper, with special regard to the similarity between techniques used by the artist for all three supports. Thirteen paintings (five on canvas and eight on panel) and seven works on paper were examined using a range of techniques to characterize materials and methods used by the artist to create these works. Our findings suggest that materials and methods of application traditionally associated with works on paper were used by Daumier also for his works on canvas and panel supports. Materials include those usually associated with drawings, such as charcoal, lithographic crayon, and thin washes of water- and oil-based paint and ink, applied with quill and reed pens. [ABSTRACT FROM AUTHOR]

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Lead white (basic lead carbonate), before its effective ban in much of Europe from 1989 onwards, was among the most versatile and widespread but also one of the most harmful pigments available. This paper is a critical discussion of the regulation of lead white paint and its consequences from the point of view of conservation and artistic practice in Europe. It looks at who benefited from exemptions to bans, and whether there was resistance to them. Buildings and artworks are both taken into account. The paper discusses nuances in regulation in four European countries which have notable differences in approach (France, Austria, Germany, and the United Kingdom). The centralised regulatory framework of the United Kingdom allows data analysis on the authorised use of the paint since its restriction up to the present day. This dataset shows a steady decrease in the use of the paint by conservators across disciplines. The paper concludes by considering the professional and ethical implications of lead white paint for artists and conservators, in the context of varied regulation and a decline in use. [ABSTRACT FROM AUTHOR]

Analytical studies of ancient Chinese handmade papers and paper-based materials have long faced challenges, due to the need for high-quality, scientifically sound data that can lead to suitable diagnostic criteria. This study applies Herzberg staining, micro-computed tomography (micro-CT), Raman spectroscopy, pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS), and high-resolution mass spectrometry (HRMS) to five Hetian Administration Banknotes (HABs), a particular type of regional banknotes issued by Ma Hu-shan (1910–1954), a Hui warlord, in southern Xinjiang between 1933 and 1937. The results shed important insights into the use of fiber and dyes on HABs, revealing how locally handmade Sangpi (bark of the mulberry tree, Morus alba L.) papers and imported synthetic dyes (Rhodamine B, Methyl Violet 2B, Direct Black 38, and presumably Sudan II) were combined to serve the needs of the regional economy in southern Xinjiang during the 1930s. We conclude the paper by tentatively proposing guidelines for applying low- and high-resolution analytical methods to understand the manufacture and use of ancient Chinese handmade papers and paper-based materials. [ABSTRACT FROM AUTHOR]

In this study, we investigated the diverse range of materials used for sizing in Iranian paper manuscripts during the Timurid (fifteenth century) to Safavid (sixteenth century) and Qajar (nineteenth century) periods. Our approach combined historical analysis with scientific examination of reconstructed sizings. We reconstructed 15 sizing materials based on identified Persian historical recipes and analysed their physical, optical, and spectral characteristics. Additionally, we assessed their behaviour against the mould fungus Aspergillus flavus. The results revealed distinctive properties for each sizing material, shedding light on their potential applications in paper preservation. Furthermore, our investigation demonstrated variations in hygroscopicity, thickness, grammage, and ash content post-sizing. The sizing materials also exhibited different effects on paper reflectance properties. Additionally, our study revealed insights into the impact of sizing on burnished papers, indicating that the mechanical process of burnishing did not significantly alter the chemical composition or spectral properties of the paper, with only minor changes in brightness observed in specific cases. All tested sizing materials supported varying levels of mould growth, indicating potential implications for paper conservation. Our findings provide valuable insights into the historical practices of Iranian paper sizing and offer practical considerations for the preservation of paper manuscripts. [ABSTRACT FROM AUTHOR]

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Boundary walls are neglected but important parts of historic urban environments, and they are often prone to serious deterioration. Understanding moisture and salt dynamics within boundary walls can help infer the causes and dynamics of deterioration. This investigation investigates the patterns of moisture, salt, and deterioration on a 300 year old limestone boundary wall in Worcester College, Oxford. Multiple methods to assess moisture and salts within and across the wall (electrical resistivity tomography, handheld resistivity-based moisture meter, paper pulp poultices, scanning electron microscopy, inductively coupled plasma optical emission spectrometry, and ion chromatography of small scale sampling of deteriorated limestone) were used in conjunction with decay mapping of both sides of the wall. The salt weathering strongly correlates with severely weathered zones at the wall and salts, mainly sulfates, seem to be the main agent of decay processes. The combined results demonstrate that the environmental influences driving stone decay can differ on a very small scale even at a comparatively simple structure like a boundary wall, and that repairs can have adverse effects if the patterns of salt and moisture dynamics are not sufficiently known. [ABSTRACT FROM AUTHOR]

The article discusses the artificial aging of paper used in the conservation of historic paper documents, focusing on the durability such treated paper. Topics include a discussion of the pigments used, such as gamboge, ochre, and carbon black ink, and plant dyes used such as valonia, tea, sophora flower bud and Cape jasmine; the practice of thermal aging and ultraviolet light ageing; the suitability of various types of commercially available paint in China for restoration work; and assessments of the tensile, fold, and tear strength of xuan paper treated with such methods.

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Studies in Conservation is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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The article discusses a project organized jointly by Japan, China, and Korea on the conservation of historical and cultural works, particularly the writing of kanji, or Chinese characters on paper. Topics include a discussion of joint investigations of traditional paper manufacturing workshops in each country; the effort to establish an international network of professionals working in the conservation and historical culture industries; and the organizations, including the UNESCO office in Beijing, China, the Association for Conservation of National Treasures in Japan, and the Korean Mounting and Conservation Association.

The article comments on the result of the analysis of the painting materials found in the studio of artist J. M. W. Turner at his death in 1851, which was conducted by N. W. Hanson, head of the Analytical Section in the Paints Division of Imperial Chemical Industries (ICI). The author is of the opinion that Hanson had to modify his use of emission spectrography, and if he is alive today, should consider the combination of reliable, reproducible, analysis of samples of complex, aged and often contaminated materials with concomitant research into out-of-print and rare historical sources. The author also believes that the claim of Hanson that he could distinguish aged mastic from aged dammar is unjustified.

The article discusses the mounting techniques of Asian silk paintings and calligraphy. Topics include details on the role of selecting mounting paper, color matching, formats, and dimensions, the effect of lining paper on the perception of tones of the painting, the effect of paper's texture, thickness, and color tone on a painting, details on the roles of color in lining paper, details on the use of water-cutting to create a feathered edge for a painting, and mention of the use of the format of hanging scroll for silk painting mounts.

This paper provides an overview of the trade in artists' materials in Canton between 1750 and 1842. Through an investigation of China's foreign trade archives and records, this study gives a picture of international trade in artists' materials, particularly pigments, during this period in Canton. Furthermore, it reveals a close trade in Western modern pigments between the West and China. The results of this research may be helpful to conservators and conservation scientists conducting treatments or technical studies on Chinese export paintings of this period. [ABSTRACT FROM AUTHOR]

Cellulose nitrate artifacts from the collections of the Queen's University Master of Art Conservation Program and Glanmore National Historic Site were examined and treated by graduate students in the Master of Art Conservation Program at Queen's. Each object was in a varied state of degradation with unique condition problems. Under the supervision of the artifacts conservation professor, graduate students identified the materials constituting their objects and tested various treatment methods for consolidation and structural repair. Paraloid® B-67 in n-butanol and Aquazol® resins in isopropanol and distilled water were found to be effective in different roles, depending on the object and its state of degradation. This paper will discuss the factors that influenced decision-making for each object, with the aim of expanding interventive treatment strategies for cellulose nitrate objects. [ABSTRACT FROM AUTHOR]

The application of Ca(OH)2 nanoparticles dispersed in short chain alcohols to adjust the pH of acidic cellulosic substrates (paper, canvas, and wood) has been introduced and largely assessed in conservation practice, and commercial products are available on the market. Recently, some concerns about this methodology were expressed in a technical note ('A Note of Caution on the Use of Calcium Nanoparticle Dispersions as Deacidifying Agents' by Cremonesi (2023)). The main criticism is that carbonation of the hydroxide particles into calcium carbonate could be too slow, and the Ca(OH)2 remaining on the fibers might cause structural damage to cellulose by producing high alkalinity in situ, when water absorbed by the alcohol dispersion or by the cellulose-based support causes dissociation in the nanoparticles. However, in Cremonesi's note, no accurate description of the application method was given, and some fundamental information already present in the literature was overlooked. Here, we give a rebuttal of Cremonesi's conclusions, providing: (1) further evidence that the correct application of the particles' dispersions results in carbonation and in neutral pH values in a few days; and (2) an up-to-date literature survey, in which the Ca(OH)2 nanoparticles' carbonation kinetics is studied in detail, and potential structural damage to cellulosic materials in an alkaline environment is evaluated and ruled out. [ABSTRACT FROM AUTHOR]