C.I. Acid Brown 84

Preparation

3-Amino-4-chlorobenzenesulfonic acid diazo, Coupled with resorcinol, and then in the copper sulfate and sodium hydroxide solution heating, make it into copper complex, and then and after diazo 2-(4-Aminophenyl)-6-methylbenzo[d]thiazole-7-sulfonic acid coupling. In the copper chloride complexation processes by hydroxyl replaced.

Properties and Applications

red light brown. Soluble in water for yellow brown, in tiny solubility in ethanol. The strong sulfuric acid in red orange for brown, after dilute for tan to yellow brown. In water solution to join strong hydrochloric acid for yellow brown; Add thick sodium hydroxide solution for red orange brown. Mainly used for leather color.