dye|World dye variety

Name:C.I.Acid Black 21,C.I.26405

Molecular Structure: Double azo class

C.I.Acid Black 21,C.I.26405,CAS 10142-78-6,745.74,C37H25N5Na2O6S2,Black A3B,Wool Fast Black 3B,Fast Black G

Molecular Formula:C₃₇H₂₅N₅Na₂O₆S₂

Molecular Weight: 745.74

CAS Registry Number:10142-78-6

Manufacturing Methods :5-Aminonaphthalene-1-sulfonic acid diazo, and Naphthalen-1-amine coupling, again diazo, and 8-(P-toluidino)naphthalene-1-sulfonic acid coupling.

Properties and Applications: black. Soluble in water for dark purple, soluble in ethanol for red light blue. The strong sulfuric acid for blue-ray black, diluted green for blue-ray. The dye solution to join strong hydrochloric acid for turquoise blue; Add thick sodium hydroxide solution have sauce red precipitate. Suitable for the wool dyeing and printing, also suitable for leather shading.

List of Suppliers:

Atul Leather Black A3B ( Atul Limited )

Atul Wool Fast Black 3B( Atul Limited )

Vondamol Fast Black G( Vondelingerplaat Dyestuffs BV )