disodium 3-hydroxy-4-(phenylazo)naphthalene-2,7-disulphonate

Preparation

aniline diazo, coupled with 3-Hydroxynaphthalene-2,7-disulfonic acid.

Properties and Applications

red light orange. Soluble in water for red orange, slightly soluble in ethanol for orange. Used for wool, silk, cotton, vinegar fiber etc of fiber dyeing and printing directly on the wool fabric. The dye aluminum salt and Barium salt for colourful red yellow light, used for paper coating.

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