photochromism

(redirected from Photochromic dyes)
Also found in: Encyclopedia.

pho·to·chro·mat·ic

 (fō′tō-krə-măt′ĭk)
adj.
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.

photochromism

(ˌfəʊtəʊˈkrəʊmɪzəm)
n
(Chemistry) chem the reversible transformation of something's colour due to exposure to electromagnetic radiation such as sunlight