photochromism
/ˌfoʊtoʊˈkroʊmɪzəm/
noun
- The property of a material to change color reversibly when exposed to light, especially ultraviolet light.
- Photochromism is the science behind eyeglasses that darken in sunlight.
- Researchers are studying photochromism to create smart windows that control heat and light.
- The photochromism of certain minerals makes them appear different colors under various lighting conditions.