azure A

az·ure A

[C.I. 52005]

asymmetric dimethylthionine chloride; a blue dye used as a component of MacNeal tetrachrome blood stain and of Romanowsky-type blood stains; also used as a stain for mucins, nucleic acids, and mast cell granules; gives a metachromatic violet to red color to highly acidic substances in tissues.

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