metachromasia

noun
meta·chro·ma·sia | \ ˌmet-ə-krō-ˈmā-zh(ē-)ə \

Medical Definition of metachromasia 

1 : the property of various tissues of staining in a different color (as when treatment with a blue aniline dye makes a cellular element red)

2 : the property of various biological stains that permits a single dye to stain different tissue elements in different colors

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