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

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

red. Slightly soluble in water for red, right amount to orange soluble in alcohol. The strong sulfuric acid for purple, for the big red after diluted, precipitation. The dye solution with strong hydrochloric acid have article red precipitate; Add thick sodium hydroxide solution for red light orange brown, have precipitation.

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