dye|World dye variety

Name:C.I.Direct Red 156,C.I.25215

Molecular Structure: Double azo class

C.I.Direct Red 156,C.I.25215,CAS 7198-98-3,789.68,C37H25N7Na2O9S,Diazo Brilliant Scarlet 3G

Molecular Formula:C₃₇H₂₅N₇Na₂O₉S

Molecular Weight: 789.68

CAS Registry Number:7198-98-3

Manufacturing Methods :  4-Nitrobenzenamine diazo, first with 2-Hydroxybenzoic acid coupling, and then will The nitro reduction, and nitrobenzene formex condensation of chlorine, then The nitro reduction nitride pay equal attention to, and 7-(4-Aminobenzamido)-4-hydroxynaphthalene-2-sulfonic acid coupling.

Properties and Applications: colourful red yellow light. Soluble in water is palm red light to orange, soluble in alcohol. The strong sulfuric acid for blue-ray in red, orange brown for colourful after diluted. Dye with strong hydrochloric acid solution for purplish red color, have precipitation; With strong sodium hydroxide solution for palm light orange, the red light.

List of Suppliers:

Diazo Brilliant Scarlet 3G( IG Farbenindustrie AG )