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The article presents research which focused on the application of an efficient diagnostic test method for color fading after laundering with activated oxygen bleach that contains detergents and under the North American conditions. The researcher mentioned that most consumers placed more importance on color care for detergents through time so detergents with built-in bleach have included color care in their market positioning. He analyzed a test method that was conceptualized in Europe to determine colored cotton fabrics that are prone to fading due to multi cycle laundering.

The article offers information on several researches on fabric finishing and dyeing which will be presented in a meeting coordinated by the U.S. Department of Agriculture on September 23 and 24, 2011. One of the studies focuses on the organization of process parameters in polyester textured intermingled yarn process. Another interesting research that will be presented in the gathering deals with the dimensional stability of cotton mercerized at increased temperatures. There is also a study about the mercerization of open end yarns and ring spun.

The article presents research which focused on the ionic copper content of copperized dyes. The researchers offered a technical background of the chemistry of such dyes and mentioned that all cupric ion are derived from salts present in the original dye or from dye dissociation. They mentioned that the thermodynamic activity of cupric ion can be identified potentiometrically with the use of an ion selective electrode which exhibits a Nerstian responder under most conditions. They added that such method has been widely applied given that electrodes are commercially available.

The article presents research which focused on the implications of the Clean Air Act in the U.S. for the use of liquid dyes. The researcher mentioned that some dyers predicted that emissions from the dyeing of carpets with the use of liquid dyes would stimulate the addition of air permit requirements under this legislation. The study elaborated the steps in the process involved in carpet dyeing with liquid dyes such as the use of a steamer in which the dyed carpet is exposed to hot moist air produced by condensing steam.

The article presents research which explored the regenerable and durable antibacterial finishing of fabrics. Some of the materials used by the researchers in this study include the nylon 6,6 filament Taffeta #306A supplied by Testfabrics Inc., Acid red 88 and Acid red 18 dyes from Aldrich Chemical Co. They dyed the nylon fabrics in solutions for one and a half hour at 95 degrees Celsius. They washed the dyed fabrics with a standard detergent after dyeing and then cured them for 15 minuted at 120 degrees Celsius.

The article presents research which focused on the one-step dyeing of polyester/cotton with disperse/reactive dyes. The researchers mentioned that the dyes are more beneficial over the conventional dyeing processes in terms of reducing the dyeing cycles as well as energy consumption. According to them, this dyeing method also eliminates the use of a hydro which is an environmentally questionable chemical in dyeing. They added that the development of the dyes has not been successful since reactive dyeing requires alkaline condition for dye fixation.

The article presents research which focused on application of super-flexible binder named as WRPU for pigment printing and dyeing. The researchers prepared a series of super flexible binders that are composed of blocked water soluble reactive polyurethane in a laboratory. They analyzed the film of the binders through the use of a Dynamic Viscoelastometer (DDV) and found that the glass transition temperature of the film was lower compared to and commonly used commercial polyacrulate type binders.

The article presents a study which focused on the effect of dyes on the ultraviolet protection factor (UPF) of fabrics. The researchers explored the different fabric parameters affection ultraviolet protection such as the construction characteristics, fiber type as well as finishing chemicals. They also suggested that darker colored fabrics like blacks and blues offer improved protection when compared to lighter colored fabrics of other hues. They investigated the influence of 14 direct dyes on ultraviolet transmittance of a light weight cotton fabric.

The article presents research which discussed the importance of controlling external variables and visual color matching. The researcher attempted to address and provide suggestions to the most critical areas that will cause troubles to textile and dyeing firms when they perform color matching. He elaborated the conditions and factors that should be considered during color matching like the setting of the hanging dimensions consistently with the rest of the industry and the repainting of the interior of the light booth before using it.

The article presents research which focused on the development of reliable pH control algorithm for use in the industry of fabric and textile dyeing. The researchers designed a pilot scale package dyeing machine incorporating an in-line pH meter and flow cell. They built it in order for them to easily and successfully use industrial pumps, actuators as well as industrial controls. They conceptualized a clear definition of pH so that they can investigate the influence of chemical addition, presence of fiber and temperature on pH valves.

The article presents research which explored the efforts of companies and governmental agencies in the U.S. to prevent pollution in the production of pigments and dyes. The researchers offered a summary of pollution prevention through waste minimization as well as source reduction ideas and successes such as process optimization in the synthesis of azo disperse dyes and pigments. They found that one of the most serious environmental issues in the leather, textile and dyestuff industries is related with the use and manufacture of metallized azo dyes that are complexed with cobalt or chromium.

The article presents a study which focused on the use of double tailed surfactants that form vesicles in the low temperature dyeing of nylon 6, polyester and diacetate fibers. The researcher used multifilament yarns of the fabrics mention after scouring them thoroughly and dyeing them in an extra pure grade of C. I. Disperse Violet 1, 1,4-diaminoanthraquinone (1,4-DAA). Comparative experiments with dyehouse grade of the dye were performed to assess the components and characteristics of the dispersing agents or surfactants.

The article examines the different aspects of continuous dyeing that affect polyester-containing fabrics. All the processes of dyeing used for polyester-cellulose blends are built around the Thermosol method which are applied when fixing the disperse dyes to the polyester portion of the blend. The major consideration for the method to be used in polyester fabrics dyeing such as in the case of the conventional one-pass method is the stages involved in cellulose coloring. According to the author, the machinery for such process represents major capital investment so it should operate at optimum efficiency.

The article presents research which dealt with the use of a novel synthetic adsorbent in the static testing of dyehouse effluent remediation. The researchers selected azo metal complex, monoazo metal complex and anthraquinone for the examination of concentrations of these three adsorbents. They added three drops of methanol to the solutions to assist in wetting out the adsorbent in each vial. They sealed the vials and placed them on a Belko rocker platform and processed them at five reversals per minute for a day.

The article presents research which discussed the application of a new colorant system in textiles ink jet printing. The researchers designed novel polymerizable dyes that offered limited color gamut that they used for textile printing. They used several instruments for the testing and characterization of the ink and dyes properties such as a spectrophometer from Perkin Elmer, a bubble pressure tensiometer from Kruss and a conductivity tester from Fisher. When it comes to the chemicals, the used the commercial form reactive blue 4 from Zeneca and the commercial form reactive yellow 3 from Ciba Geigy.

The article presents research which focused on the development of an automated dyebath and process for its reuse in a production facility. The researchers altered the standard dyeing process in order to capture the maximum amount of energy, water and chemicals for reuse. They also modified the equipment used in the process and added piping and valves to the plumbing of the dyebath to transfer the bath from and to the holding tank. They created two types of dye systems which they used for the hot-start/hot-drop trials.

The article presents research which explored the use of feed forward profiles in the control of dyeing machinery. The researchers performed a novel method of feedforward control based on the use of pre-set profiles that are exponential, linear, sigmiuidal and quadratic in shape. They achieved this method by assessing various elements like dye concentration and pH level in the dye liquor through attached instrumentation to a pilot scale dyeing machine. They also calculated the desired rate of exhaustion in controlled exhaustion profiles.

The article presents a study which examined the bleaching of wheat straw for potential industrial applications. The researchers assessed the factors that influenced the trend related to the use of alternative cellulosic fibers in consumer and industrial products like geotextiles and building materials. They also analyzed the compositions of the available cellulosic fibers such as bamboo and grasses, milkweed and kapok as well as cereal straws and sugarcane bagasse. They used layered strawboards for commercial applications with outer layers dyed with basic dyes for this research.

The article presents research on the effect of blending on the color appearance of black and white fiber blends. The researchers examined whether the uneven distribution of pre-colored fibers can have an influence on the resulting color of fabrics or the yarns. They also assessed how to compensate for the deviations in the formulation of the color of fibers. They used mass-pigmented 100 percent polyester staple fibers, open-end spinning machine, knitting machine as well as a spinning frame from Martin Color-Fi Inc.

The article discusses the results of a study that determined whether a correlation exists between crosslinking of lyocell fibres with reactive dyes and fibrillation. The experimental materials and methods are provided, including scoured and bleached woven lyocell, dyeing and wash-off process to remove any unfixed dye from the sample. The study showed that when the dyed samples were washed-off, the wet abrasion resistance was reduced. Additionally, the wet abrasion resistance declines with increasing temperature of the dyeing. The study concluded that dyed lyocell displayed higher wet abrasion than undyed lyocell.

The article discusses the results of a study that examined whether Tetra Acetyl Ethylene Diamine (TAED) can be used in combination with hydrogen peroxide to reduce chemical costs, bleaching temperature and residence time and can provide useful benefits within the textile industry. The chemistry of TAED is discussed, including reaction of one mole with two moles of perhydroxide anion to form two moles of peracetic anion and one mole of Di Acetyl Ethylene Diamine (DAED). The study showed that TAED also reacts under acidic or near neutral conditions to produce a strong oxidant believed to be peracetic acid. It is concluded that the use of TAED to activate peroxide provides a safe, flexible and effective method of bleaching textiles.

The article discusses the approaches and equipment used in instrumental evaluation of fabric pilling. Auto-iris lens are used in image analysis system to retain consistent brightness over dark and bright colors of fabrics while a 3-chip color charged-couple device (CCD) camera is needed to ensure accurate color information for pattern removing. It suggests conducting a mapping in which dark pixels in the original image turn to black while brightest pixels turn to white to enhance the image of the fabric structure and pills. The FFT technique was found to be useful in locating peaks in the spectrum during extraction of pills.

The article discusses the integrated color management systems to achieve true optimization and full cost savings. Some areas of the textile industry in which various elements of color management technology have been developed, including the design area, the dyelab and the dyehouse. A discussion on the color creation and communication is given, including the use of computer-based design systems to allow stylists to quickly create unique product designs and colorways. The dyeing parameters for dyeing 100 percent polyester on a jet machine are provided, including heating speed, dyeing time and temperature.

The article discusses the role of the Color Marketing Group (CMG) in the textile industry and the effects of its color selection. An overview of the CMG, a 35-year-old international non-profit organization with 1,500 color designers and marketers, is provided, including the principle focus of the group and its meetings. A discussion on the method of color forecasting done by the CMG is provided. Some factors that influence color forecasting include the economy, the environment, sports and aging society. The article notes that growing influence of yellow in color palettes which has pushed color design toward the green-yellows.

The article discusses the colour measurement technology and its benefits. Some benefits from colour measure are discussed, including improvement in product quality, cost savings and uniformity with quicker deliveries together with control and economy in raw materials. A chart is presented showing results from a typical application project with a production of 10 tonnes of fabric every day. The history of colour measurement is provided. The study concludes that colour measurement technology for recipe prediction and correction, quality control of colour and colour sorting is well established, particularly in the textile industry.

The article discusses the results of a study that determined the use and reuse of bromoacrylamido reactive dyes for microfibre and conventional nylon 6,6. Strategies that can be adopted in dyebath recycling are discussed, including removal of colour from the exhausted dyebath to facilitate re-use of the water and auxiliary chemicals. The experimental methods and materials are discussed, including commercial samples of scoured, conventional and microfibre fabrics and reconstitution of dyebaths. The study showed that neutral pH conditions employed in the dyeings carried out in the original dyebath facilitated both exhaustion and fixation.

The article discusses the developments in reactive and disperse dyes and their applications which have been designed to support the Controlled Coloration philosophy. Factors that are needed to focus the skills of the dyehouse management team on managing production include the definition of standard operating procedures, defining processing auditing and defining, checking and recording manually or instrumentally all on-line processing parameters. It notes the availability of computer modelling techniques to calculate the structure of speculative organic dyes to cellulose. A chart illustrating the Reactive Dye Compatibility Matrix (RCM) for the Procion H-EXL dyes within the eXceL Controlled Coloration team performance is given.

The article discusses the results of a study that examined the surface modification of polyethylene terephthalate (PET) polyester fiber during the dyeing process to produce new styles of polyester fabrics. It outlines what has been done and introduce a dyeing process for PET polyester fabrics and yarns. A description of the caustic treatment with alkali metal hydroxide solutions is given. Also discussed is the process that allows to caustic treat and dye polyester fabrics and yarns in one procedure. The production techniques are discussed, including fabric construction, texturizing techniques and dry finishing processes such as brushing, napping and sanding.

The article discusses the results of a study that determined if ultrafiltration (UF) could be proposed to the U.S. Environmental Protection Agency (EPA) and can be used as a technique for distinguishing between free metal ions and total metal. The experimental design is presented, including dyes and transition metal sales used and protocols for most of the solutions and filtrations. The study showed that free metals do not go through the membrane at their initial concentrations. It also notes that separation efficiency must be demonstrably high for the filtration method to be useful. Additionally, the extent of metal loss from the chelates would be inversely related to pH.

The article discusses results of the use of flow injection analysis (FIA) and high-performance liquid chromatography (HPLC) in on-line monitoring of reactive batch dyeing exhaustion and hydrolysis. The experimental materials and methods are discussed, including a syringe pump, mixing chamber, Waters 600E pump with gradient controller and dyeing procedures including isothermal, traditional, high temperature and all-in. The development of Partial Least Squares (PLS) as a statistical method for converting absorbance measurements of mixtures to individual dye concentrations is discussed. Also discussed is the HPLC method development.

The article discusses the results of a study that examined the ElectroMolecular Propulsion (EMP), which is a novel electrokinetic molecular technology, for the evaluation of textile dyes. It describes EMP as a high resolution technique which can immediately distinguish between different kinds of dye molecules and their molecular variants. An example of an EMP media formulations is provided. The study materials and methods are discussed, including the EMP 15K instrument which is a specialized high voltage supply providing direct current high voltage. The study concluded that EMP is both practical and advantageous as an analytical technology for dyes.

The article describes how computer-aided optimization can be used to increase the profitability of exhaust dyeing operations. It describes DyStar Textilgarben GmbH & Co.'s Compudye System for computer-aided dyeing, with emphasis on its objective to replace the various non-optimized standard dyeing procedures. System requirements are discussed, including physico-chemical data, characteristic data for the dyeing units and mathematical formulas to calculate the optimum amount of auxiliaries and dyeing conditions. The optimization steps are described, including polyester and blends, acrylic fibers and blends and polyamide and wool.

The article discusses an analytical system that can economically analyze carpet dyebaths in real time Types of multiple wavelength detectors that can measure the intensities of ultraviolet, visible and near infrared radiation are photodiode arrays (PDA) and charge coupled device (CCD). Also discussed are different approaches used to correct for background absorbance of auxiliary chemicals, including a flow cell designed for a dual beam high-performance liquid chromatography (HPLC) instrument and a single beam flow cell. A description of the analysis systems is given. The study concludes that analytical systems have been interfaced with laboratory dyeing machines.

The article discusses the development of continuous carpet dyeing for commercial and residential. The history of carpet dyeing is provided. Also discussed is the first continuous carpet dyeing which was started in Great Britain by Bradford Dyer's Association (BDA) and the development of the Stalwart-Pickering machine. The article describes the selection of dyes for continuous dyeing of nylon, with DuPont Type 501 nylon as the initial popular fibers to be dyed and differential dyeing by mixing and tufting different fiber types together. Major problems with the Eduard Kusters Maschinenfabrik range include tailing caused by differing dye affinities in a three dye combination and heavy pollution of the dye liquor.

The article discusses the results of a study that determined the mechanical, thermal and color properties of the modified polyurethane (PU). The experimental methods and materials are discussed, including chemicals such as comonomers, extenders, coupling agent and dyestuffs, synthesis of PU with covalent bond of dye molecule and measurement of mechanical properties using an Instron Mode 1122 Type. A discussion of the code of all PU dyed or undyed polymer films is given as well as infrared spectra analysis and inherent viscosity analysis. The study concluded that the PU with covalent bond of dye molecule can contribute better dyeing property than that without.

The article analyzes the effects of increases in temperature and pressure on shade in the stock dyeing of polyethylene terephthalate (PET) fiber using disperse dyes with supercritical fluid (SCF) CO2. Recirculation of SCF demonstrated more uniform dyeing than those without but have no significant effect on shade. No significant differences were noted in terms of dye in the fiber and surface dye between the SCF and conventional aqueous dyeing using the commercial disperse dye known as Red 1A. Fibers dyed with SCF demonstrated darker shade than the aquaeous dyed fiber and were uniformly dyed.

The article discusses the results of a study that investigated the bleaching and dyeing characteristics of sugar cane fiber bundles. The experimental methods are discussed including the use of hydrogen peroxide as a bleaching agent and direct dyes specific to cellulosic fibers for dyeing. The study showed a highly significant cubic effect on strain, tex and tenacity and a linear effect of modulus. Also, in the bleaching process, concentration and temperature are the main parameters that influence the partial removal of non cellulosic components. It is concluded that hydrogen peroxide is effective for bleaching cellulosic fibers with a high content of lignin and other components.

The article discusses the results of a study on an alternative method, based on accelerated solvent extraction (ASE), that would take less time, labor and amount of solvent required for the production of woven fabric. The ASE method involves the water and enzyme extraction steps from the American Association of Textile Chemists and Colorists (AATCC) standard method. A discussion on instruments and chemicals used, yarn samples, preparation procedure, dyeing procedure, weight loss calculations and cooling and weighing procedure is given. The study concluded that the ASE method did not completely replace AATCC standard method.

The nonpolar, crystalline nature of polypropylene fiber, with associated low saturation uptake, has tended to preclude dyeing of this fiber in all but very light shades by use of conventional dyes and dyeing procedures. Although modified versions of polypropylene are capable of being dyed, there still is a need for a practical, commercially viable method for dyeing unmodified fiber. A technique is being explored at The University of Georgia that may offer a solution to this difficult dyeing problem. Initial laboratory findings are presented and areas for further study are solicited. [ABSTRACT FROM AUTHOR]

A paper, presented at the 1995 AATCC International Conference and Exhibition, by the same authors discussed the application of polymeric cationic aftertreatment agents to the oxidised dyeings of CI Solubilised Sulphur, CI Leuco Sulphur and CI Sulphur dyes. It was demonstrated that aftertreatment resulted in the dyeings displaying markedly improved fastness to the ISOC06/C2 wash fastness test. Further work has been carried out to examine the use of polymeric cationic agents as aftertreatments for the oxidised dyeings of CI Leuco Sulphur dyes when applied by continuous methods. The application of two commercial cationic agents by either a Pad-Dry or Pad-Flash Cure procedure to the oxidised dyeings of four CI Leuco Sulphur dyes resulted in improved fastness to the ISOC06/C2 wash test, without effecting the shade or fabric handle. This compared favourably with a commercial crease resist agent which, when applied by the Pad-Flash Cure method, improved the wash fastness but imparted a harsh handle to the fabric and dulled the shade in some cases [ABSTRACT FROM AUTHOR]

The conditions to dye nylon 6,6 with the β-sulphatoethylsulphone reactive dye, Remazol Brilliant Blue R (Hoechst), were optimised, in order to obtain maximum dyebath exhaustion coupled with a maximum degree of dye-fibre covalent bonding. The dyed fibre was hydrolysed with 6N HCl in order to determine the extent of terminal amino group involvement in the fixation reaction. Using model compounds it was shown that (Remazol Brilliant Blue R-1-amino)-hexane-6-amine was stable to acid hydrolysis whereas the disubstituted product, (bis-Remazol Brilliant Blue R-1-amino)-hexane-6-amine was not. Thus HPLC was employed to separate and quantify N-Remazol Brilliant Blue R - hexamethylene diamine adducts. Surprisingly it was shown that only about 30% of the terminal amino groups are available for covalent reaction with the dye. Presumably fibre crystallinity and the build up of fixed negative charges are responsible for this effect. [ABSTRACT FROM AUTHOR]

When lyocell fabric was dyed with three commercial dichlortriazinyl reactive dyes using the dyeing method recommended by the dye maker, each dye displayed good build-up. Various wash-off procedures were used to remove unfixed dye from the dyeings using Na2CO3 rather than surfactant in an attempt to not only reduce the cost of wash-off but also to lessen the environmental impact of wash-off. The fastness of the dyeings to the ISO C06/C2 wash test was also determined. [ABSTRACT FROM AUTHOR]

The article discusses the properties of dyeable polyolefins for carpets, their suitable dyes and their dyeing processes. It compares the physical properties, fibers and characteristics of the BCF KROMALON polyolefin resin and the polypropylene BCF. Disperse dyes commonly use in polyester, acetate and polyamide demonstrated low performance on KROMALON but the resin showed potential for multicolor continuous dyeing. It recommends several disperse dyes for polyolefins in pad or print/steam applications. Preparation of dye liquors include dispersion of disperse dye in water at 110 to 120°Fahrenheit.

Ionomeric polyester fiber is produced first to overcome the limitations of polyethylene terephthalate (PET) fiber, particularly those related to coloring. Na-5-Sulfo-dimethylisophthalate is used as the ionic comonomer which imparts affinity to basic/cationic dyestuffs for the fiber. The ionomeric fiber known as Cationic Dyeable Polyester (CDP) fiber, however, has low mechanical properties, problems of high diethylene glycol content and high alkali sensitivity. Over the years, these drawbacks of CDP-fiber have been eliminated by modifying the ionomeric polymer in various ways. This paper reviews these developments and theoritical understanding of the ionomeric polymer structure. Now ionomeric polyesters are used apart from the CDP-fiber, in bicomponent fibers to get a variety of effects, very low denier fibers, and for fibers which finally are free from the ionic comonomer. The concentration of ionic comonomer in the ionomeric polymer is varied over a very wide range to get polymers with interesting useful properties. Now we can have CDP-fiber with mechanical properties matching to those of PET fiber. [ABSTRACT FROM AUTHOR]

The article presents a study on the wet fastness of disperse dye on polyester. It notes that there has been an increase in consumer complaints regarding wet fastness on polyester fiber, adding that attention has also been directed to the synthetic fiber Shin-gosen. It relates the processes involved in the study in which a commercial polyester filament fabric was immersed in a dyebath comprised of disperse dyes, anionic surfactant and acetate buffer. Findings of the study suggest that the amount of thermomigration as well as the affinity of the dye to the staining white cloth are responsible for the washing fastness of the textile.

"Right-First-Time" is more than a buzz phrase of the nineties. It can mean the difference between success and failure in a dyeing industry facing demands of tighter color specifications, higher quality standards and shorter production runs. Studies reveal, for example, that even with 80% RFT performance, the 20% "Wrong-First-Time" may account for between 30 and 50% of both machine time and production cost to the polyester dyer. "Controlled Coloration" is a Total Quality approach to management of the dyehouse. It starts with a full audit of current performance and establishment of a monitoring system. It involves introduction of tight controls of all raw materials in the dyeing operation from the water and substrate, through to dyes and chemicals. It requires exploitation of the machine control provided by the latest microprocessors and on-line monitoring systems. Key to achievement of Controlled Coloration is understanding how disperse dyes behave at each stage of the polyester dyeing cycle, so that dye and process selection can be optimised to maximise shade reproducibility and to ensure that levelling and fastness requirements are met. Controlled Coloration is the pursuit of excellence in the dyehouse. It is an approach that demands that Right-First-Time means more than the token bar chart on the Plant Manager's wall, but that it becomes the "culture" by which the whole dyehouse operates. [ABSTRACT FROM AUTHOR]

This paper is a summary of results from our evaluating the potential utility of some iron-complexed azo and formazan dyes as acid dyes for protein and polyamide substrates, especially nylon and wool. We have demonstrated that certain of the dyes synthesized as analogs of commercial chromium and cobalt complexes have fastness properties that are comparable to commercially important acid black dyes and that colors other than the traditional browns can also be obtained. As anticipated, it has also been shown that the iron complexes generally possess satisfactory genotoxicity (mutagenicity) and aquatic toxicity. The relationship between the toxicological properties of the presented dyes and their chemical structure is also presented. [ABSTRACT FROM AUTHOR]

The article focuses on a study on the aquatic toxicity, salinity and water hardness of effluent discharge water from textile dyeing and finishing operations. The U.S. National Pollutant Discharge Elimination System (NPDES) has created a process for five-year permits for effluent limits yet additional limits that address toxicity are placed when the technology-based limits appear to fail in the goal of water quality protection. It explores the impact of water hardness on salinity toxicity by using the survival and reproduction data of the organism, Ceriodaphnia (C.) dubia. Findings suggest that an increase in the hardness of very soft water leads to a decline in the toxicity of metals to C. dubia.

In a very competitive textile industry, Right-First-Time in textile coloration supporting Dynamic Response offers an effective means of differentiating service and gaining competitive advantage. The importance of process design and optimisation to achieve Right-First-Time production is reviewed. New techniques for the acquisition of data that permit on-line monitoring of the key measures of dyestuff performance, neutral substantivity, secondary exhaustion, rate of fixation and rate of wash off are described for the application of Homo Bi-Functional reactive dyes to cellulose substrates. The data has been used for designing novel and highly productive dyeing and wash off profiles that meet the demands of the modern dyehouse. [ABSTRACT FROM AUTHOR]

The article discusses the cleanup of bleach using catalase. Bleach Cleanup has been described as the removal of excess hydrogen peroxide following the bleaching process. Classical methods used in removing residual hydrogen peroxide are discussed, one is through rinsing with fresh water, another is through the use of reducing agents and the last involves the use of catalase in which hydrogen peroxide is broken down into non-active oxygen and water. Several advantages of using the catalase approach are given which include low water consumption, short process time and safe dyeing.