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1. (Chemistry) an alteration in the colour of certain substances as a result of being exposed to light of different wavelengths
2. (Chemistry) the reversible loss of colour of certain dyestuffs when illuminated at a particular wavelength
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
The ability of certain substances to change color reversibly on exposure to light of a certain wavelength.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited