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Direct Blue 128

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

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.

Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water
Fading Stain Fading Stain
ISO 4 4-5 2 3-4 3-4

List of Suppliers:

Diazamine Pure Blue 4B( Francolor Pigments SA )


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