2-Hydroxy-3-[(1-hydroxy-4-sulfo-2-naphthalenyl)azo]-5-sulfobenzoic acid trisodium salt

3-Amino-2-hydroxy-5-sulfobenzoic acid diazotization, and 4-Hydroxynaphthalene-1-sulfonic acid coupling.

brilliant red light purple. Moderate soluble in water (in red) and ethanol (orange). In concentrated sulfuric acid for product red, orange for after diluted. Dye aqueous solution to join concentrated hydrochloric acid for nacarat, Join concentrated sodium hydroxide solution for orange.

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