Definition: salts of a theoretical base, R–?N or R–N=NOH, useful in histochemistry to demonstrate tissue phenols and aryl amines or with enzymatically released naphthols and naphthylamines to form the chromophore azo group –N=N–; diazonium salts contain only one R–?N group, tetrazonium salts contain two, and hexazonium salts contain three; examples include fast garnet GBC base and naphthol AS.
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