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Powdered dibromoindigo


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; CI 75800

Other 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


  • 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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