1,2,3-Benzenetriol, 4-[(4-hydroxyphenyl)azo]-

Preparation

4-Aminophenol diazotization, with Benzene-1,2,3-triol coupling.

Properties and Applications

red light brown. Slightly soluble in water for green light yellow, slightly soluble in ethanol for green yellow. In concentrated sulfuric acid for yellow brown, dilution after orange brown. Dye aqueous solution to join concentrated hydrochloric acid for orange, add people concentrated sodium hydroxide solution for red orange brown.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	3-4	3	3	2	4	3-4	5