Definition that contains azo dye
- diazonium the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes
- congo red a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
- gamma acid a crystalline acid used to make azo dyes
- methyl orange an azo dye used as an acid-base indicator; used for titrations involving weak bases