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Processes like oxidation and photodegradation, which fall under dye-destruction, often result in polymer damage and can lead to changes in the dyeability of regenerated fibers. [17] While dye-extraction is a frequently employed technique in forensic science, it falls short of achieving complete color removal from textiles. [17]
Hair dye stripping is a chemical process involving the application of a sulfur-based product to hair in order to remove deposited color.Hair dye strippers raise sulfite levels to make hair more porous and reverse the oxidation of color molecules.
Desperate times call for desperate measures, so I decided to dye my own hair for the first time in my life. (Note to self: never again.) Once I realized that my highlights.
Printing is the process of adding localized or patterned color to fabrics. [2] Discharge printing involves dyeing first with dischargeable dyes; subsequently, the dyed fabric undergoes a printing process involving the application of a chemical-infused paste that effectively removes the color imparted by the dye.
Heterogeneous photocataylsis is one approach to the degradation of dyes. [3] As applied to dye-containing effluents from the textile industry, several approaches are standardized for removal or degradation of dyes. [4] These include oxidation, e.g. using air or hydrogen peroxide, ozone, or Fenton chemistry.
Also called direct dyes, substantive dyes are employed for cellulose-based textiles, which includes cotton. The dyes bind to the textile by non-electrostatic forces. In another classification, azo dyes can be classified according to the number of azo groups. Trypan blue is an example of a direct dye, used for cotton.
Direct dyes are used on cotton, paper, leather, wool, silk, and nylon. Mordant dyes require a mordant, which improves the fastness of the dye against water, light and perspiration. The choice of mordant is very important as different mordants can change the final color significantly.
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