6-(5-Chloro-2-hydroxy-4-sulfophenylazo)-5-hydroxy-1-naphthalenesulfonic acid disodium salt

Chemical Properties

dark blue fine crystalline powder

Preparation

3-Amino-5-chloro-2-hydroxybenzenesulfonic acid diazotization, and 5-Hydroxynaphthalene-1-sulfonic acid?coupling.

Properties and Applications

red light navy blue. This product soluble in water is purple, in the water solubility is 50 g/l (80 ℃), slightly soluble in alcohol. In concentrated sulfuric acid for blue purple, dilution to pink; In concentrated nitric acid for yellow brown. Its aqueous solution to join concentrated hydrochloric acid to red; With strong caustic for magenta. Mainly used for wool, silk, nylon dyeing and color matching dye.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	5	6	4	4	4-5	4-5	4-5
AATCC	4-5	7	4		4-5	5