(1100) Anilin Brown and Black.

Manufacturer and Builder ?, 1874

Treat anilin oil or nitro-benzole with bichromate of potash and an excess of sulphuric acid, with or without heat. The product is a dyestuff which, when separated from the rest, colors wool brown, and will color it black if the material is treated in a bath of bichromate of potash, and afterward in an alum bath. This treatment has lately been patented in England by J. Casthelar, of Manchester.