5-[(2-Chloro-4-nitrophenyl)azo]-2-hydroxybenzoic acid sodium salt

2-Chloro-4-nitrobenzenamine diazotization, and 2-Hydroxybenzoic acid?coupling.

red orange. Soluble in water and Etanol for yellow. In concentrated sulfuric acid for golden orange, dilution after light golden brown. Dye aqueous solution to join concentrated hydrochloric acid for green yellow; Join concentrated Sodium hydroxide solution for red wine.

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