Naphtho[2,1-d]thiazole-8-sulfonic acid, 2-(4-aminophenyl)-7-[[4-[(4-chloro-2-sulfophenyl)azo]-3-methylphenyl]azo]-6-hydroxy-, disodium salt

2-Amino-5-chlorobenzenesulfonic acid diazo,Coupled with?m-Toluidine?, its product to diazo, and 2-(4-Aminophenyl)-6-hydroxynaphtho[2,1-d]thiazole-8-sulfonic acid coupling.

Red, purple. Moderate soluble in water for purplish red color, soluble in ethanol for product red. The strong sulfuric acid in blue, diluted red for brown. The dye solution to join strong hydrochloric acid have red light brown precipitation; Add thick Red sauce sodium hydroxide solution have precipitation.

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