2-[[6-[[(2-Carboxyphenyl)amino]sulfonyl]-2-hydroxy-1-naphthalenyl]azo]benzoic acid disodium salt

Preparation

2-Aminobenzoic acid diazotization and 2-(2-Hydroxynaphthalene-6-sulfonamido)benzoic acid coupling.

Properties and Applications

dark yellow red. Soluble in water and ethanol as golden orange. In concentrated sulfuric acid to orange, orange for gold after diluted. Dye aqueous solution to join concentrated hydrochloric acid for orange; Join concentrated sodium hydroxide solution for orange.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	4-5	7	4-5	3	3-4	5	5