polychrome methylene blue

polychrome methylene blue
a polychromatic mixture of several blue cationic thiazine dyes (including azures A, B, and C) and at least one uncharged dye, methylene violet Bernthsen; made by prolonged boiling of aqueous solutions of methylene blue, usually with alkali and sometimes with an oxidizing agent. It is commonly used as the cationic component of thiazine-eosinate stains.

Medical dictionary. 2011.

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