4-[(4-Amino-2-methyl-5-methoxyphenyl)azo]-1'-hydroxy-[1,2'-azobisnaphthalene]-4',6-disulfonic acid disodium salt

N-(4-amino-2-methoxy-5-methylphenyl)acetamide diazo, and 5-Aminonaphthalene-2-sulfonic acid coupling, product to diazo, and 4-Hydroxynaphthalene-1-sulfonic acid coupling, and then hydrolysis acetyl amino.

dark blue to navy blue. Soluble in water for navy to violet black, slightly soluble in ethanol to blue. In the strong sulfuric acid as dark blue, for purple diluted. The dye solution to join strong hydrochloric acid has the purple precipitation; With strong sodium hydroxide solution for the navy.

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