The reason why color-changing cups can change color is because the pigment on cups can change color according to different temperature, and color-changing pigment is also called color-changing toner, consisting of Implicit colored agent, color developing agent and sensitizer. When the temperature changes, color developing agent will release proton. After implicit colored agent absorb proton, the cups will change color. Certainly, the whole color changing system needs a special solvent, so all the pigments have been processed package technology.