Dibromoindigo

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Powdered dibromoindigo

Description

A synthetic coal tar dye of the same composition (6,6'-dibromoindigo) as Murex purple. Dibromoindigo was developed in 1904 causing the expensive natural product to became obsolete.

Synonyms and Related Terms

6,6'-dibromoindigo; 6,6'-dibromoindigotin; CI 75800

Physical and Chemical Properties

  • Insoluble in organic solvents and water.
  • Unaffected by alkalis.
  • The color is lightfast except when exposed to nitric acid or chlorine bleaches.
  • CAS = 17670-06-3

Resources and Citations

  • Helmut Schweppe, Schweppe color collection index and information book Comment: CI 75800, ammonia-sodium dithionite vat or sodium hydroxide-sodium dithionite vat

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