dye|World dye variety

Name:C.I.Direct Blue 295,C.I.23820

Molecular Structure: Double azo class

C.I.Direct Blue 295,C.I.23820,CAS 6420-22-0,858.76,C34H25N6Na3O11S3,Navy Blue BM,Direct Blue 2B-NB

Molecular Formula:C₃₄H₂₅N₆Na₃O₁₁S₃

Molecular Weight: 858.76

CAS Registry Number:6420-22-0

Manufacturing Methods :  3,3′-Dimethylbenzidine double nitriding, in alkaline conditions first and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid coupling, and then in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.

Properties and Applications: blue. Soluble in water for deep purple, soluble in ethanol. The strong sulfuric acid for blue, for purple diluted. The dye solution to join strong hydrochloric acid for dark purple; Add thick sodium hydroxide solution for dark purple.

List of Suppliers:

Benzo Navy Blue BM( Bayer Group )

Direct Blue 2B-NB(Yorkshire Group pic)

Fabramine Blue 2B-NB( Fabricolor Inc. )