A well defined group of the coal-tar colors, all containing the diatomic group bound on either side to a benzene radical. They may be prepared by reduction of the nitro-compounds in alkaline solutions, or by acting on diazo-compounds with phenols or amins of the aromatic series. The azo-dyes are the amido-derivatives of simple azo- compounds, and are to be distinguished as amidoazo- dyes and oxyazo-dyes. See Conspectus of Pigments, under Pigment.
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