dye|World dye variety

Name:C.I.Direct Red 57,C.I.26720

Molecular Structure: Double azo class

C.I.Direct Red 57,C.I.26720,CAS 6406-48-0,738.66,C33H20N6Na2O8S2,Benzo Scarlet FBS

Molecular Formula:C₃₃H₂₀N₆Na₂O₈S₂

Molecular Weight: 738.66

CAS Registry Number:6406-48-0

Manufacturing Methods : aniline diazo, and 2-(3-Aminophenyl)-6-hydroxynaphtho[2,1-d]thiazole-8-sulfonic acid coupling, its product to diazo, coupled with the 4-Hydroxynaphthalene-1-sulfonic acid.

Properties and Applications: colourful red yellow light. Soluble in water for orange red to big red, right amount soluble in alcohol is palm light orange. The strong sulfuric acid in red for quality, to orange diluted. The dye solution to join strong hydrochloric acid have red precipitate; Add thick sodium hydroxide solution for orange brown.

List of Suppliers:

Benzo Scarlet FBS( Bayer Group )