disodium 5-[(2,5-dichloro-4-sulphonatophenyl)azo]salicylate

Preparation

4-Amino-2,5-dichlorobenzenesulfonic acid diazotization, and 2-Hydroxybenzoic acid coupling.

Properties and Applications

dark yellow to dark red light yellow. Soluble in water for yellow, moderate soluble in ethanol for green yellow. In concentrated sulfuric acid for orange to red, dilution after light green light yellow, In concentrated nitric acid for titian. Dye aqueous solution to join concentrated hydrochloric acid for green yellow; Join concentrated Sodium hydroxide solution for orange.

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