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Acid Black 21

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

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.

Standard Light Fastness Soaping Persperation Fastness Oxygen bleaching Fastness to seawater
Fading Stain Fading Stain Fading Stain
ISO 6 5 4 4-5 4 3-4 4-5 4-5

List of Suppliers:

Atul Leather Black A3B ( Atul Limited )

Atul Wool Fast Black 3B( Atul Limited )

Vondamol Fast Black G( Vondelingerplaat Dyestuffs BV )


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