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phototropy

/ˌfəʊtəʊˈtrəʊpɪ/
noun (chem)
1.
an alteration in the colour of certain substances as a result of being exposed to light of different wavelengths
2.
the reversible loss of colour of certain dyestuffs when illuminated at a particular wavelength
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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