1. The property or phenomenon of a substance changing color when exposed to light and returning to its original color when the light source is removed.
Usage: plural form; technical/scientific term; commonly used in materials science and chemistry

Examples

• Photochromisms in certain organic compounds make them useful for creating smart windows.
• The photochromisms displayed by these dyes allow them to darken in sunlight and fade indoors.
• Scientists study photochromisms to develop new optical materials.
• Photochromic lenses rely on photochromisms to automatically adjust their tint.
• The reversible photochromisms of these molecules make them ideal for data storage applications.