disodium 6-amino-5-[(4-amino-2-sulphonatophenyl)azo]-4-hydroxynaphthalene-2-sulphonate

2-Amino-5-nitro-N-ethylbenzenesulfonanilide diazo, and 6-Amino-4-hydroxynaphthalene-2-sulfonic acidin acid conditions coupled, thenthe product was then reducing the nitro group to an amino group with sodium.

dark red light purple. Soluble in water and ethanol for product red. The strong sulfuric acid for yellow brown, after dilute for pink. Its water solution to join strong hydrochloric acid for red; Add thick sodium hydroxide solution for ruby red colour.

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