dye|World dye variety

Name:C.I.Direct Black 90,C.I.21530

Molecular Structure: Double azo class

C.I.Direct Black 90,C.I.21530,CAS 6449-77-0,601.52,C22H17N7Na2O7S2,Para Black R

Molecular Formula:C₂₂H₁₇N₇Na₂O₇S₂

Molecular Weight: 601.52

CAS Registry Number:6449-77-0

Manufacturing Methods : 2-(4-Aminophenylamino)-2-oxoacetic acid diazo, and Benzene-1,3-diamine coupling, and then 2-(4-Aminophenylamino)-2-oxoacetic acid hydrolysis of the product to diazo, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-1,7-disulfonic acid coupling.

Properties and Applications:  black. Moderate soluble in water for dark purple, soluble in ethanol. In the thick of sulfur acid for green light blue, diluted is shallow brown. The dye solution to join strong hydrochloric acid for red sauce, precipitation; Add thick sodium hydroxide solution for purple.

List of Suppliers:

Para Black R(  Bayer Group )