dye|World dye variety

Name:C.I.Solubilised Vat Brown 7 ,C.I.73406

Molecular Structure: Thioindigo class

C.I.Solubilised Vat Brown 7,C.I.73406,651.45,C21H10Cl2Na2O9S4,Anthrasol Brown IVD

Molecular Formula:C₂₁H₁₀Cl₂Na₂O₉S₄

Molecular Weight: 651.45

CAS Registry Number:

Manufacturing Methods :  (a) in the presence of Pyridine , with Chlorosulfonic acid treatment C.I. 73405 leuco; (b) in the Pyridine with metal (such as copper, iron, zinc, etc) and Sulfur trioxide source (such as Sulfur trioxide, Chlorosulfonic acid or Methyl chlorosulfonate, etc.) processing C.I. 73405. The above two kinds of situation after alkaline, filter out insolubles, remove Pyridine and salting out.

Properties and Applications: dark red light brown. Soluble in water for red light brown.

List of Suppliers:

Anthrasol Brown IVD ( IG Farbenindustrie AG )