dye|World dye variety

Name:C.I.Direct Black 4,C.I.30245

Molecular Structure: trisazo class

C.I.Direct Black 4,C.I.30245,CAS 2429-83-6,795.76,C35H27N9Na2O7S2,Direct Black R,Direct Black RW

Molecular Formula:C₃₅H₂₇N₉Na₂O₇S₂

Molecular Weight: 795.76

CAS Registry Number:2429-83-6

Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, first with aniline diazo,In alkaline conditions with 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid  coupling monoazo compound obtained under acidic conditions in the coupling , then and 4-Methylbenzene-1,3-diamine coupling.

Properties and Applications:  black. water-soluble ash light black,, and adequate soluble in ethanol (for blue-ray grey) and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid in the dark for the light blue, red red after diluted sauce to black precipitation; In nitric acid solution for brown (not completely); In strong hydrochloric acid for wine solution (not completely).

List of Suppliers:

Direct Black R(Colorom SA)

Direct Black RW ( Multicrom SA )

Multicuer Black RW ( Multicrom SA )

Vopsider Black DR(Colorom SA)