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Aniline Black

When a salt of aniline in solution is exposed to the action of certain oxydizers, as salts of copper, a black dye, of such depth that ordinary gall or madder blacks appear gray or green in comparison. The fastness of this color, its resistance to the action of acids, alkalies, soaps, and sunlight, render it of great importance to manufacturers, and make it one of the great achievements of late years. 2567. Phosphate of Lime as a Mordant. A rather thick syrupy solution of phosphate of lime (bone-ash) in hydrochloric acid having been recently recommended as a mordant to be used after a previous sumaching of the goods, Dr. Reimann states that, according to his researches, the phosphate of lime solution is altogether superfluous for aniline producing aniline blacks have been devised