Is Azure B vegan?

Azure B

Vegan

Azure B is a cationic thiazine dye used in histology and cytology as a biological stain for nucleic acids and polysaccharides, and as a component of Romanowsky-type blood stains. It is closely related to methylene blue and is a member of the azure dye series.

Also known as Methylene azure B
CAS number 531-55-2
CI number CI 52010
Last reviewed 3 June 2026

Sources

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