These pigments glow-in-the-dark. They are “charged” through the absorption of photons and then release this energy in the form of different color (wavelength) of light.
These pigments change color under UV light (the sun). They absorb electromagnetic radiation, which causes a reversible transformation of a chemical species between two forms. In the case of our color pigments, they change color.
These pigments change color based on the temperature they are exposed to. After absorbing a certain amount of heat, the crystallic or molecular structure of the pigment reversibly changes in such a way that it absorbs and emits light at a different wavelength than at lower temperatures, thereby changing it’s color.