dye|World dye variety

Name:C.I.Direct Black 21,C.I.31580

Molecular Structure: trisazo class

C.I.Direct Black 21,C.I.31580,CAS 6428-51-9,849.74,C35H26N9Na3O9S2,Direct Resist Black M

Molecular Formula:C₃₅H₂₆N₉Na₃O₉S₂

Molecular Weight: 849.74

CAS Registry Number:6428-51-9

Manufacturing Methods : N-(4-aminophenyl)acetamide diazo, in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid, hydrolysis amido group, and a double nitride, first with 8-Aminonaphthalene-2-sulfonic acid coupling, again with N-(2-methyl-5-aminophenyl)glycine coupling.

Properties and Applications: black. Soluble in water for blue-ray black. The strong sulfuric acid in dark green. The dye solution to join hydrochloric acid have blue-black precipitation; Add sodium hydroxide colored light red.

List of Suppliers:

Direct Resist Black M( Industria Chimica Dott  )