Dyes are coloring unsaturated organic substances have been used for the coloration of textile materials. Most of the dyes are water soluble. A dye molecule consists of there 3 parts such as:
(1) Chromophore groups - Color bearing part or group of dye molecule
(2) Auxochrome groups - Color helping group which determines the properties of dyes
(3) Chromogen groups - Hold the structure of dyes
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