chromoisomerism
noun
chro·mo·isom·er·ism
ˌkrō-(ˌ)mō-ī-ˈsäm-ə-ˌriz-əm
: isomerism in which the isomers are of different colors
—used especially of cases in which the isomers are tautomeric
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Merriam-Webster unabridged
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