disodium 4-hydroxy-3-[(2-methoxyphenyl)azo]naphthalene-2,7-disulphonate

Preparation

p-Anisidine diazo, coupled with 4-Hydroxynaphthalene-2,7-disulfonic acid.

Properties and Applications

red. Soluble in water for red to product red, slightly soluble in ethanol and acetone, insoluble in other organic solvents. The strong sulfuric acid for purple, diluted red for quality. The dye solution to join strong hydrochloric acid for product red; Add sodium hydroxide is palm orange.

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