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Is Metacresol Purple vegan?

Metacresol Purple (m-cresol purple), also known as m-cresolsulfonphthalein, is a synthetic triarylmethane dye used as a pH indicator. It is applied as a capnographic indicator for detecting end-tidal carbon dioxide to confirm tracheal intubation, and can measure pH in subzero temperatures of saline or hypersaline media.

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