photo chromic


(of chemically treated glass or plastic) capable of darkening or changing color when exposed to light.

1950–55; photo- + chrom- + -ic

photochromism, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photochromic (ˌfəʊtəʊˈkrəʊmɪk)
(of glass) changing colour with the intensity of incident light, used, for example, in sunglasses that darken as the sunlight becomes brighter

Collins English Dictionary - Complete & Unabridged 10th Edition
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