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Acid dyes are water-soluble anionic dyes that are applied to fibers such as silk, wool, nylon, and modified acrylic fibers using neutral to acid dye baths. Attachment to the fiber is attributed, at least partly, to salt formation between anionic groups in the dyes and cationic groups in the fiber. Acid dyes are not substantive to cellulosic fibers.
An acid dye is a dye that is typically applied to a textile at low pH. They are mainly used to dye wool, not cotton fabrics. [1] Some acid dyes are used as food colorants, [2] [3] and some can also be used to stain organelles in the medical field. Acid dyes are anionic, soluble in water and are essentially applied from acidic bath.
Examples of acid dye are Alizarine Pure Blue B, Acid red 88, etc. Basic dyes are water-soluble cationic dyes that are mainly applied to acrylic fibers, but find some use for wool and silk. Usually acetic acid is added to the dye bath to help the uptake of the dye onto the fiber. Basic dyes are also used in the coloration of paper.
Acrylic fibers are dyed with basic dyes, while nylon and protein fibers such as wool and silk are dyed with acid dyes, and polyester yarn is dyed with dispersed dyes. Cotton is dyed with a range of dye types, including vat dyes, and modern synthetic reactive and direct dyes.
dye Dyes are color-bearing organic compounds that can be dissolved in water or another liquid so that they will penetrate fibers. [19] dyebath A dyebath is a solution of dye and water or other liquid in which textiles are dyed. [20] dyed in the wool Dyed in the wool or dyed in the fleece refers to fibers that are dyed prior to spinning.
This is a list of dyes with Colour Index International generic names and numbers ... Basic dye 11050 azo 2869-83-2 ... Wool red B Fast milling red B Acid red 115 ...
Dyes and pigments can be categorized according to their synthetic or chemical properties. British chemist Edward Chambers Nicholson showed that pure aniline produced no dye. Hofmann showed that toluidine must be present to make these dyes. Aniline dyes, including mauve, are prepared from aniline-containing amounts of toluidine. [19]
Colour fastness is a term—used in the dyeing of textile materials—that characterizes a material's colour's resistance to fading or running.Colour fastness is the property of dyes and it is directly proportional to the binding force between photochromic dye and the fibre.
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