Principle: The color-changing cup is composed of an outer cup and an inner cup arranged coaxially. There is a sandwich cavity filled with heat-sensitive color-changing volatile liquid between the bottom ends of the two cups. The inner cup The outer wall is engraved with an artistic graphic channel that communicates with the cavity of this layer. After pouring hot water into the drinking cup, the heat-sensitive liquid in the interlayer cavity will change color and rise into the graphic channel of the inner cup, causing the cup wall to show an artistic pattern.
The heat-sensitive liquid is in the inner layer of the cup. It does not come into contact with the beverage in the cup and will not evaporate through the cup wall~