dye|World dye variety

Name:C.I.Direct Black 28,C.I.35260

Molecular Structure: Multi-azo class

C.I.Direct Black 28,C.I.35260,CAS 6745-67-1,867.83,C36H31N13Na2O7S2

Molecular Formula:C₃₆H₃₁N₁₃Na₂O₇S₂

Molecular Weight: 867.83

CAS Registry Number:6745-67-1

Manufacturing Methods : 4-Nitrobenzenamine (2 Moore) diazo, one in acid conditions, a in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid (1 Moore) coupling, and then will the nitro reduction for amino, again diazo, and 4-Methylbenzene-1,3-diamine (2 Moore) coupled.

Properties and Applications: black. Soluble in water for blue-ray black, slightly soluble in ethanol is green. The strong sulfuric acid for blue-ray green, blue after diluted precipitation. The dye solution to join strong hydrochloric acid blue precipitation; Add thick sodium hydroxide solution for green light blue.

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