dye|World dye variety

Name:C.I.Acid Black 28,C.I.20500

Molecular Structure: Double azo class

C.I.Acid Black 28,C.I.20500,CAS 5850-41-9,630.52,C23H16N6Na2O9S2,Naphthalene Black 12BR

Molecular Formula:C₂₃H₁₆N₆Na₂O₉S₂

Molecular Weight: 630.52

CAS Registry Number:5850-41-9

Manufacturing Methods : 2-Methyl-5-nitrobenzenamine diazo, in acid conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acidcoupling, and then aniline diazo, in alkaline conditions and formation of single accidentally coupled nitrogen compounds.

Properties and Applications: blue and black. Soluble in water, slightly soluble in ethanol, very few soluble in acetone, insoluble in benzene. The strong sulfuric acid for green, diluted green for blue-ray.

List of Suppliers:

Naphthalene Black 12BR( Francolor Pigments SA )