Is Trypan Blue vegan?

Trypan Blue

Vegan

Trypan Blue is a synthetic azo dye used as a direct dye for cotton textiles and, in biosciences, as a vital stain to selectively colour dead tissues or cells blue, enabling cell viability assessment. It is produced entirely from synthetic precursors.

Also known as Direct Blue 14, Niagara Blue 3B
CAS number 72-57-1
CI number CI 23850
Last reviewed 3 June 2026

Sources

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