photochromic
/ˌfəʊtəʊˈkrəʊmɪk/adjective
(of a substance) undergoing a reversible change in colour or shade when exposed to light of a particular frequency or intensity
（物质）光致变色的：
photochromic sunglasses.
光敏变色太阳镜。
派生词
词源
1950s: from
PHOTO-'relating to light' + Greek
khrōma 'colour' +
-IC.