5-Chloro-4-hydroxy-3-[[4'-[(1-hydroxy-4-sulfo-2-naphtyl)azo]-3,3'-dimethoxy-1,1'-biphenyl-4-yl]azo]-2,7-naphthalenedisulfonic acid trisodium salt

Preparation

3,3′-Dimethoxylbenzidine double nitriding, first with 8-Chloro-1-naphthol-3,6-disulfonic acid?coupled, again with 4-Hydroxynaphthalene-1-sulfonic acid coupling.

Properties and Applications

blue. Soluble in water for purple, slightly soluble in alcohol. The strong sulfuric acid for blue-ray green and purple, for the red light purple diluted. The dye solution to join strong hydrochloric acid for purple, have precipitation; Add thick sodium hydroxide solution into a red light purple.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	4-5	3	2	1-2		1-2