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| phototropy (1 an alteration in the color of certain substances as a result of being exposed to light of different wavelengths; 2 the reversible loss of color of certain dyestuffs when illuminated at a particular wavelength) | |||
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| phototropy (1 an alteration in the color of certain substances as a result of being exposed to light of different wavelengths; 2 the reversible loss of color of certain dyestuffs when illuminated at a particular wavelength) | |||