BENZIDINE (DIPARA-DIAMINO-DIPHENYL),NH 2 C 6 H 4 C 6 H 4 NH2, a chemical base which may be prepared by the reduction of the corresponding dinitro-diphenyl, or by the reduction of azobenzene with tin and hydrochloric acid.
In alkaline solution azobenzene results, while arsenic acid produces the violet-colouring matter violaniline.
Potassium permanganate in neutral solution oxidizes it to nitrobenzene, in alkaline solution to azobenzene, ammonia and oxalic acid, in acid solution to aniline black.
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