Acid Brown 119

Preparation

3-Aminobenzenesulfonic acid diazo, and Benzene-1,4-diamine coupling ; 4-Nitrobenzenamine diazo, Coupled with resorcinol; And then the double nitriding 2,4-Diaminobenzenesulfonic acid respectively with the above two single accidentally coupled nitrogen compounds.

Properties and Applications

brown. Dark brown powder. Soluble in water for yellow light brown. Strong sulfuric acid in a yellow light brown, a yellow brown after diluted precipitation. Its water solution to join strong hydrochloric acid have yellow brown precipitation; Add thick sodium hydroxide solution for blue-ray red.