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3 results on '"Artificial light radiation"'

1. Under the spotlight: A new tool (artificial light radiation) to bleach paper documents.

Author

Pérez, Ana Reyes, Arias, Teresa Espejo, García, María Rosario Blanc, Escolano, Amparo, and Hernández, Nuria Gómez

Subjects
*ENGRAVING, *ARCHES, *HYDROGEN peroxide, *RADIATION, *DIGITAL printing, *HISTORICAL source material
Abstract

• Artificial light radiation is a viable tool for paper documents bleaching. • Artificial light bleaching does not produce any physico-chemical change in paper. • Artificial light bleaching reduces the yellowing of paper in short and long term. • Paper is physico-chemical and optically deteriorated by hydrogen peroxide. This study offers a new tool to restorers to bleach paper documents: artificial light radiation (ALR). It is a controlled method that is an alternative to other highly aggressive procedures that have been applied to cellulose based media. Its main novelty is its intrinsic lighting characteristics which guarantee uniformity and avoid heating the paper. The results of testing this new tool were compared to those of bleaching with hydrogen peroxide (H 2 O 2). Each of the two methods was applied to five different types of widely used paper: Arches and Somerset (brands serving for engraving and digital printing), Ingres (drawing), press-type (magazines and newspapers) and Bible-type (historical documents). Once characterised by physico-mechanical, chemical and optical parameters (grammage, thickness, specular gloss, optical properties, air permeance, tensile properties, determining the pH of both surface and aqueous extracts), the different papers were bleached by the two methods according to pre-established criteria. Finally, to determine the evolution and effects of the two treatments, the papers were subjected to accelerated ageing. [ABSTRACT FROM AUTHOR]

Published
2021
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2. Under the spotlight: A new tool (artificial light radiation) to bleach paper documents

Abstract

This study offers a new tool to restorers to bleach paper documents: artificial light radiation (ALR). It is a controlled method that is an alternative to other highly aggressive procedures that have been ap plied to cellulose based media. Its main novelty is its intrinsic lighting characteristics which guarantee uniformity and avoid heating the paper. The results of testing this new tool were compared to those of bleaching with hydrogen peroxide (H2O2). Each of the two methods was applied to five different types of widely used paper: Arches and Somerset (brands serving for engraving and digital printing), Ingres (drawing), press-type (magazines and newspapers) and Bible-type (historical documents). Once charac terised by physico-mechanical, chemical and optical parameters (grammage, thickness, specular gloss, optical properties, air permeance, tensile properties, determining the pH of both surface and aqueous extracts), the different papers were bleached by the two methods according to pre-established criteria. Finally, to determine the evolution and effects of the two treatments, the papers were subjected to accel erated agein

Published
2021

3. Under the spotlight: A new tool (artificial light radiation) to bleach paper documents

Author

Teresa Espejo Arias, Nuria Gómez Hernández, Ana Reyes Pérez, Amparo Escolano, and María del Rosario Blanc García

Subjects
Paper, Archeology, Grammage, Bleach, Computer science, Materials Science (miscellaneous), Calcium hydroxide, Conservation, Permeance, Engraving, Specular reflection, Process engineering, Spectroscopy, Artificial light radiation, Artificial light, business.industry, Hydrogen peroxid, Hydrogen peroxide, Gloss (optics), Chemistry (miscellaneous), visual_art, visual_art.visual_art_medium, Bleaching, Digital printing, business, General Economics, Econometrics and Finance
Abstract

This work was supported by the research group "Ciencia y Cultura del Patrimonio"(HUM-1057) and the Ministerio de Economia y Competitividad in the framework of the I + D research project "Nuevas alternativas al conocimiento de los materiales y los procesos de conservacion y restauracion de obra grafica y patrimonio documental"(REF.MAT2014-58659-P). Funding for open access charge: Universidad de Granada/CBUA., This study offers a new tool to restorers to bleach paper documents: artificial light radiation (ALR). It is a controlled method that is an alternative to other highly aggressive procedures that have been applied to cellulose based media. Its main novelty is its intrinsic lighting characteristics which guarantee uniformity and avoid heating the paper. The results of testing this new tool were compared to those of bleaching with hydrogen peroxide (H2O2). Each of the two methods was applied to five different types of widely used paper: Arches and Somerset (brands serving for engraving and digital printing), Ingres (drawing), press-type (magazines and newspapers) and Bible-type (historical documents). Once characterised by physico-mechanical, chemical and optical parameters (grammage, thickness, specular gloss, optical properties, air permeance, tensile properties, determining the pH of both surface and aqueous extracts), the different papers were bleached by the two methods according to pre-established criteria. Finally, to determine the evolution and effects of the two treatments, the papers were subjected to accelerated ageing., Research group "Ciencia y Cultura del Patrimonio" HUM-1057, Spanish Government MAT2014-58659-P, Universidad de Granada/CBUA

Published
2021

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