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Direct Blue 3

Name:C.I.Direct Blue 3,C.I.23705

Molecular Structure: Double azo class

C.I.Direct Blue 3,C.I.23705,CAS 2329-72-3,741.70,C34H25N5Na2O8S2,Cibacet Blue BN

C.I.Direct Blue 3,C.I.23705,CAS 2329-72-3,741.70,C34H25N5Na2O8S2,Cibacet Blue BN

Molecular Formula:C34H25N5Na2O8S2

Molecular Weight: 741.70

CAS Registry Number:2329-72-3

Manufacturing Methods :  3,3′-Dimethylbenzidine double nitriding, first in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling, and then and 4-Hydroxynaphthalene-1-sulfonic acid coupling.

Properties and Applications: dark red light blue. Soluble in water for violet black, slightly soluble in ethanol for red light purple. The strong sulfuric acid for green light blue, diluted red for purple, have precipitation; In nitric acid for dark purple, and then into a red light purple. Dye with strong hydrochloric acid solution for purple, have precipitation; Add thick sodium hydroxide solution for purplish red color, have precipitation.

Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water
Fading Stain Fading Stain
ISO 4 4 1 1-2 2
AATCC 5 2-3 2 3 2

List of Suppliers:

Cibacet Blue BN( Classic Dyestuffs Inc )


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