Diazo dyes of the type : A ——> Z ——> A1
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Diazo dyes of the type : A ——> Z ——> A1
Various coupling components (Z) can be used for their production, examples of coupling components being resorcinol, metaphenylene diamine, H-acid, etc. One representative example of the dye of this type is Naphthol Blue black wherein A is para nitro-aniline, A1 is aniline and Z is H-acid.
