1,6-Naphthalenedisulfonic acid, 4-[[4-[[1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl]azo]-1-naphthalenyl]azo]-, trisodium salt

4-Aminonaphthalene-1,6-disulfonic acid diazo, and Naphthalen-1-amine coupling, its product to diazo, in alkaline conditions and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling.

red light blue. Soluble in water for deep purple, and adequate soluble in alcohol. The strong sulfuric acid as dark blue in green, for purple diluted. The dye solution to join strong hydrochloric acid for red light blue precipitation; Add thick sodium hydroxide solution for red light purple, have precipitation.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	4	5	3	2		2
AATCC	2	4	3	2		2