ACID ALIZARIN VIOLET N

red powder

3-Amino-4-hydroxybenzenesulfonic acid diazotization, and Naphthalen-2-ol coupling.

Convert the acid to the monosodium salt by precipitation with NaOAc/AcOH buffer of pH 4, then purify by precipitation of the free acid from aqueous solution with conc HCl, washing and extracting with EtOH in a Soxhlet extractor. The acid precipitates on evaporating the EtOH and is reconverted to the sodium salt as described for Chlorazole Sky Blue FF. Dry it at 110o. It is hygroscopic. [Coates & Rigg Trans Faraday Soc 57 1088 1961, Beilstein 16 II 127.]

dark red light purple. Soluble in water for magenta, soluble in ethanol for red orange, slightly soluble in acetone. In concentrated sulfuric acid to red light purple, after dilution to orange; In concentrated nitric acid for yellow brown. Dye aqueous solution to join concentrated hydrochloric acid for orange; Join concentrated sodium hydroxide solution for brown light orange.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	3-4	6	4	3-4	4-5	5	5
AATCC	4	6	4-5		5	4-5	5