Acid mordant Brown 92

Preparation

2-Amino-4-nitrophenol diazotization, and 5-Hydroxynaphthalene-1-sulfonic acid coupling.

Properties and Applications

brown. Soluble in water for wine red, soluble in ethanol to red. In concentrated sulfuric acid to purple, dilution after pink. Dye aqueous solution to join concentrated hydrochloric acid to red; Join concentrated sodium hydroxide solution for red orange brown.