- The condition in which a cell or tissue component takes on a color different from the dye solution with which it is stained.
- A change in the characteristic color of certain basic thiazine dyes, such as toluidine blue, when the dye molecules are bound in proximate array to tissue polyanionic polymers, such as glycosaminoglycans.
[meta- + G. chroma, color]
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Examples: glitazone, GI cocktail, etc.