disodium 3-[[4-(acetylamino)phenyl]azo]-4-hydroxynaphthalene-2,7-disulphonate

N-(4-aminophenyl)acetamide diazo, coupled with 4-Hydroxynaphthalene-2,7-disulfonic acid.

blue-ray red. Soluble in water for blue-ray red, part of the soluble in ethanol and acetone, slightly soluble in toluene. The strong sulfuric acid for red, diluted the bright red for; In nitric acid yellow orange?for color. In aqueous solution to join strong hydrochloric acid for red; Add sodium hydroxide for yellow brown.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	4	2	5	3	1	4	1	1
AATCC	4	4	4	3	1	1	2	2