7-[[[[4-(Acetylamino)phenyl]amino]carbonyl]amino]-4-hydroxy-3-[(2-methylphenyl)azo]-2-naphthalenesulfonic acid sodium salt

O-Methylaniline diazo, and 7-(3-(4-Acetamidophenyl)ureido)-4-hydroxynaphthalene-2-sulfonic acid coupling.

yellow light red. Soluble in water for red orange, soluble in ethanol for orange. The strong sulfuric acid in red for product, after diluted to orange, red precipitate. The dye solution to join strong hydrochloric acid for red orange; Add thick sodium hydroxide solution for red orange

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