Dibromoindigo

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; 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