1H-Naphth[1,2-d]imidazole-8-sulfonic acid, 2-(3-aminophenyl)-6-hydroxy-7-[(2-methylphenyl)azo]-, monosodium salt

O-Methylaniline diazo, and 2-(3-Aminophenyl)-6-hydroxynaphtho[2,1-d]thiazole-8-sulfonic acid coupling.

red. Soluble in water for red, soluble in ethanol for orange red. The strong sulfuric acid for product red, diluted in red. The dye solution to join strong hydrochloric acid for red; Add thick sodium hydroxide solution have orange brown precipitation.

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