Benzenesulfonic acid, 3,3'-(carbonyldiimino)bis[6-[(2,4-diaminophenyl)azo]-, disodium salt

Preparation

1,3-Bis(4-amino-3-sulfophenyl)urea double nitriding, and Benzene-1,3-diamine (2 Moore) coupled.

Properties and Applications

red light brown. Moderate soluble in water for golden yellow to orange, and adequate soluble in alcohol. The strong sulfuric acid for purple, for yellow brown after diluted. The dye solution to join strong hydrochloric acid for dark brown, have precipitation; Add thick sodium hydroxide solution discoloration.

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