photochromism

photochromic

[foh-tuh-kroh-mik]
adjective
(of chemically treated glass or plastic) capable of darkening or changing color when exposed to light.

Origin:
1950–55; photo- + chrom- + -ic

photochromism, noun
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World English Dictionary
photochromic (ˌfəʊtəʊˈkrəʊmɪk)
 
adj
(of glass) changing colour with the intensity of incident light, used, for example, in sunglasses that darken as the sunlight becomes brighter

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