dye|World dye variety

Name:C.I.Solubilised Vat Black 2 ,C.I.73831

Molecular Structure: Carbazole class

C.I.Solubilised Vat Black 2,C.I.73831,CAS 6711-18-8,582.51,C25H16N2Na2O8S2

Molecular Formula:C₂₅H₁₆N₂Na₂O₈S₂

Molecular Weight: 582.51

CAS Registry Number:6711-18-8

Manufacturing Methods : (a) in the presence of Pyridine , with Chlorosulfonic acid treatment  C.I. Vat Black 2 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. Vat Black 2. The above two kinds of situation after alkaline, filter out insolubles, remove Pyridine and salting out.

Properties and Applications: blue light grey to blue black. Light gray powder. Soluble in water. Can be used for cotton fabric dyeing, affinity is low, add salt may help dye. Can also be used to direct, resist and discharge printing, discharge base color with light color effect is good.

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