sodium 4-hydroxy-3-[[3-(phenylsulphamoyl)-p-tolyl]azo]naphthalenesulphonate

5-Amino-2-methyl-N-phenylbenzenesulfonamide?diazo, coupled with the 4-Hydroxynaphthalene-1-sulfonic acid.

red light orange. Soluble in water for palm orange, slightly soluble in ethanol and acetone, insoluble in other organic solvents. The strong sulfuric acid for purple, orange and brown after diluted to appear red purple precipitation. In water solution to join strong hydrochloric acid for orange brown; Add thick sodium hydroxide solution in red. Copper, iron ion in color shade darker. This product used for wool, silk, polyamide fiber and its blended fabric dyeing and printing, also can be used for leather color.

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