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Of or relating to a substance or object whose color changes on exposure to light: photochromatic glasses that darken in sunlight.

pho′to·chro′mism (-krō′mĭz′əm) n.


(Chemistry) chem the reversible transformation of something's colour due to exposure to electromagnetic radiation such as sunlight
References in periodicals archive ?
In the future we'll see the same photochromic dyes that dynamically cause vision lens [eye glasses] to darken when exposed to sunlight and lighten in the shade, applied to windshields.
Upon excitation, the chemical species of the photochromic dyes change form such that the absorption band shifts in strength or wavelength.
com)-- Printing of design elements with photochromic dyes is the unique technology developed by DanCo Decor Company in terms of its annual presentation program.