sodium 5-[[4-acetamido-2-[(p-tolyl)sulphonyl]phenyl]azo]-6-amino-4-hydroxynaphthalene-2-sulphonate

3-(4-Tolylsulfonyl)-4-aminoacetanilide?diazo, and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid? in acid conditions coupled.

red light purple. Soluble in water for red, slightly soluble in ethanol and acetone. The strong sulfuric acid in dark green light for red, diluted red for blue-ray. In water solution to join 10% sulfuric acid as shallow red; Add 10% sodium hydroxide solution for the light is still red.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	6	3-4	4	3-4	1	1	3-4	2
AATCC	6	2-3	2-3	1	1	1	3-4	3-4