dye|World dye variety

Name:C.I.Direct Blue 128,C.I.27140

Molecular Structure: Double azo class

C.I.Direct Blue 128,C.I.27140,CAS 6226-72-8,665.61,C28H21N5Na2O8S2,Diazamine Pure Blue 4B

Molecular Formula:C₂₈H₂₁N₅Na₂O₈S₂

Molecular Weight: 665.61

CAS Registry Number:6226-72-8

Manufacturing Methods : 5-Amino-8-nitronaphthalene-2-sulfonic acid diazo, and 2-Amino-4-methylanisole coupling, again diazotization and 7-Hydroxynaphthalene-2-sulfonic acid coupling, and then will the nitro reduction for amino.

Properties and Applications: blue. Soluble in water for dark purple, slightly soluble in alcohol. The strong sulfuric acid in purple to basket for color, diluted for orange.

List of Suppliers:

Diazamine Pure Blue 4B( Francolor Pigments SA )