dye|World dye variety

Name:C.I.Direct Blue 31,C.I.23690

Molecular Structure: Double azo class

C.I.Direct Blue 31,C.I.23690,CAS 5442-09-1,843.75,C34H24N5Na3O11S3,Dianil Blue 2R

Molecular Formula:C₃₄H₂₄N₅Na₃O₁₁S₃

Molecular Weight: 843.75

CAS Registry Number:5442-09-1

Manufacturing Methods :  3,3′-Dimethylbenzidine double nitriding, first and 4,5-Dihydroxynaphthalene-2,7-disulfonic acid coupling, again with 4-Hydroxynaphthalene-1-sulfonic acid coupled

Properties and Applications:  red light blue. Soluble in water for deep purple, slightly soluble in alcohol for red light purple. The strong sulfuric acid for green light blue, purple for red after diluted. The dye solution to join strong hydrochloric acid for deep purple; Add thick sodium hydroxide solution for purplish red color.

List of Suppliers:

Dianil Blue 2R( Farbwerke vorm. Meister Lucius &Brtining )