dye|World dye variety

Name:C.I.Direct Red 8,C.I.28105/28015

Molecular Structure: Double azo class

C.I.Direct Red 8,C.I.28105/28015,CAS 5873-18-7,662.01,C25H18ClN5Na2O8S2,Sirius Rubine R

Molecular Formula:C₂₅H₁₈ClN₅Na₂O₈S₂

Molecular Weight: 662.01

CAS Registry Number:5873-18-7

Manufacturing Methods : 2-Amino-5-chlorobenzenesulfonic acid diazo, and a coupling  m-Toluidine , product to diazo, and  7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.

Properties and Applications: colourful red blue light. Soluble in water for product red, slightly soluble in ethanol, insoluble in other organic solvents. The strong sulfuric acid for blue, pink is diluted; In nitric acid in purple precipitation. The dye solution with strong hydrochloric acid have blue-ray red to purplish red precipitate; Add thick sodium hydroxide solution have red light purple precipitation.

List of Suppliers:

Sirius Rubine R( Bayer Group )