8-[(4-Amino-3-methoxyphenyl)azo]-6-ethoxy-5-[(2-hydroxy-6-sulfo-1-naphtyl)azo]-2-naphthalenesulfonic acid disodium salt

N-(4-amino-2-methoxyphenyl)-3-oxobutanamide diazo, and 5-Amino-7-ehtoxy-2-naphthalenesulfonic acid?coupling, its product to diazo, and 6-Hydroxynaphthalene-2-sulfonic acid coupling, and then ?hydrolyzed acetamido.

blue. Soluble in water for hidden cyan, slightly soluble in alcohol for green light blue. In the dark for the strong sulfuric acid, diluted for purple. The dye solution to join strong hydrochloric acid for violet black, precipitate; With strong for sodium hydroxide solution of dark, precipitation.

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