1, the principle of color-changing water cup is to coat a layer of color-changing paint (also known as heat-sensitive paint) in the cup body, which will change color with the change of temperature.

When the temperature of the water in the cup changes, you can see the effect of the discoloration of the outer surface of the cup.

3. When the temperature rises, the chemical composition in the heat-sensitive coating will change, thus changing the color of the coating.

This change usually reflects the temperature change according to the subtle change of color, for example, changing from black to dark blue means the temperature rises, and changing from dark blue to light blue means the temperature drops.