polychrome methylene blue

pol·y·chrome meth·yl·ene blue

an alkaline solution of methylene blue that undergoes progressive oxidative demethylation with aging (ripening) to produce a mixture of methylene blue, azures, and methylene violet.
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References in periodicals archive ?
Blood smears were made from all dead and ailing animals, fixed with methanol and stained by polychrome methylene blue staining as per standard procedures.