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Any of various red, brown, or yellow acidic or basic dyes derived from amino compounds.
(Dyeing) 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
any of a class of dyes containing one or more azo groups.
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|Noun||1.||azo dye - any dye containing one or more azo groups|
congo red - a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
methyl orange - an azo dye used as an acid-base indicator; used for titrations involving weak bases