Photochromism is the reversible transformation of a chemical species between two forms by the absorption of electromagnetic radiation, where the two forms have different absorption spectra. Trivially, this can be described as a reversible change of colour upon exposure to light. The phenomenon was discovered in the late 1880s, including work by Ma...
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http://en.wikipedia.org/wiki/Photochromism
photochromism Changing color as a result of exposure to incident radiation; a property of certain organisms when exposed to the light of a particular wavelength.
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http://www.wordinfo.info/words/index/info/view_unit/2803/6
A reversible change in color of a specimen due to exposure to light.
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