Chromism

Chromism refers to the ability of a substance to change color in response to changes in certain external conditions, such as temperature, light, or chemical environment. There are several types of chromism, including: 1. **Thermochromism** - Change of color with temperature. Substances exhibit different colors at different temperatures due to changes in molecular structure or interactions. 2. **Photochromism** - Change of color when exposed to light.