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.
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