photochromic
/ˌfoʊtoʊˈkroʊmɪk/
adjective
- Describing a material that changes color when exposed to light, especially ultraviolet light.
- Many modern sunglasses use photochromic technology to adapt to changing light conditions.
- The photochromic paint on the building's windows turns blue in bright sunlight.
- Photochromic lenses darken automatically when you go outside on a sunny day.
Synonyms