sodium 3-[(2,4-diaminophenyl)azo]-4-hydroxy-5-nitrobenzenesulphonate

Preparation

3-Amino-4-hydroxy-5-nitrobenzenesulfonic acid diazotization, and Benzene-1,3-diamine coupling.

Properties and Applications

dark red light brown. Soluble in water for wine red to purplish red, soluble in ethanol for olive yellow brown. In concentrated sulfuric acid for orange to red light brown, dilution after golden yellow, yellow brown precipitation. Dye aqueous solution to join concentrated hydrochloric acid for golden orange; Join concentrated sodium hydroxide solution for red orange brown.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	5	5	5	4	4-5	5	5