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

O-Methylaniline diazo, and 2-(4-Aminophenyl)-6-hydroxynaphtho[2,1-d]thiazole-8-sulfonic acid?coupling.

blue-ray red. Soluble in water for big red, soluble in ethanol is palm light orange. The strong sulfuric acid for product red, diluted becomes shallow. The dye solution to join strong hydrochloric acid have article red precipitate; Add thick sodium hydroxide solution have orange brown precipitation.

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