8-Amino-10-phenylphenazin-2(10H)-one?and brimstone roasting, with or without Copper sulfate monohydrate all can. This Pyridine is 1 mol p-Phenylenediamine and 1 Moore mixture of aniline and oxide (1155 46-48).
Properties and Applications
purple. In concentrated sulfuric acid to dark red light brown, dilution red brown after precipitation.