C.I. Direct Brown 132

Preparation

N-(3-aminophenyl)formamide diazo, and 3,5-Diamino-4-methylbenzenesulfonic acid coupling, hydrolysis amino acylation, product double nitriding, and 90% Benzene-1,3-diamine and ?10% 2,4-Diaminobenzenesulfonic acid (2 Moore) coupled.

Properties and Applications

red light brown. Soluble in water for orange brown, soluble in ethanol for red orange brown, soluble in soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid in dark green light for blue, dilute for yellow brown after; In nitric acid in red for brown; In 10% of black light brown for sulfuric acid. The dye solution to join strong hydrochloric acid have orange brown precipitation; Add thick sodium hydroxide solution have orange brown precipitation.