azo dye

noun

Chemistry.

1. any of a large class of dyes containing one or more azo groups.

azo dye

noun

1. any of a class of artificial dyes that contain the azo group. They are usually red, brown, or yellow and are obtained from aromatic amines

Word History and Origins

Origin of azo dye¹

First recorded in 1880–85

Example Sentences

But some of the chemicals involved, such as azo dyes, contain materials linked to cancer and other harmful effects.

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They include aniline black, a permanent black produced by the oxidation of aniline, and the ice colours, which are azo dyes derived from certain coal-tar products containing nitrogen.

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In this manner a new azo dye is produced upon the fibre, which differs from the original one not only in colour, but also by being faster to washing and other influences.

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Then there are some members of the azo dyes, particularly the croceine scarlets, which can also be dyed on the cotton by the aid of tin, lead or alum mordants.

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The vast majority belong to the group of azo dyes, which can be employed to dye from palest pinks to the deepest crimson reds.

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