dye|World dye variety

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

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.

List of Suppliers:

Cibacet Blue BN( Classic Dyestuffs Inc )