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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