The principle of color changing :
the colorful surface of the tea pet coated with a layer of thermal discoloration material. Covered the colorful tea pet, when pouring the hot water and the temperature reached a certain heat ,the discoloration material will have a physical reaction and turn into a transparent or other color.
So the colorful tea pet color will appear. Generally it’s nontoxic, leadfree, without chromium, not the chemical color changing, can be ease with it.
