A derivative of diphenyl, being a greyishyellow, crystalline, basic body which melts at 1270 C. and boils at 400 degrees C. It is soluble m alcohol, ether, and hot water, and is of importance in the colour industry, because the socalled “substantive” colours, which dye unniordanted cotton directly, can be obtained from it. Congo red and chrysamine belong to this group of colours. Benzidine is prepared by reducing nitrobenzene with zinc dust in alkaline solution, or by the electrolysis of that substance, followed by distillation.

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Definition of  BENZIDINE