disodium 4,4'-[(4,6-diamino-1,3-phenylene)bis(azo)]bisnaphthalene-1-sulphonate

Preparation

2 Moore 4-Aminonaphthalene-1-sulfonic acid diazo, and 1 Moore Benzene-1,3-diamine coupling.

Properties and Applications

red light brown. Soluble in water for red light brown, slightly soluble in ethanol is shallow orange brown. The strong sulfuric acid for purple, dilute after brown precipitation. In water solution to join hydrochloric acid with brown precipitation; Add thick sodium hydroxide solution have red brown precipitation

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