Many azo dyestuffs are sulfonic acid derivatives and are thus soluble in water. They are used as acid dyes for wool, and their affinity for cotton is increased by the number of auxochromes or azo groups. Alkylation of phenolic groups increases fastness. Azo dyes are used as pigments, in color photography, and as dyestuffs for most materials. They can be used as mordant or pre-metallized dyestuffs. For more on azo dyes, see aniline.
Related category• ORGANIC CHEMISTRY
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