I WONDER - Why Do Crystals Change Color?

The video tutorial explains how certain crystals can change color when exposed to light or heat, a phenomenon known as thermochromism and photochromism. It highlights examples of minerals like tourmaline and opal, as well as synthetic crystals that exhibit these properties. The tutorial also discusses practical applications, such as in thermometers and color-changing pigments.

What are some synthetic materials that can exhibit color change?

In what applications are the properties of thermochromism and photochromism used?