It is composed of two parts, an outer cup and an inner cup arranged coaxial, and a sandwich cavity filled with thermochromic volatile liquid is arranged between the bottom ends of the two cups, and an artistic graphic channel through the layer cavity is carved on the outer wall of the inner cup.
After the drinking cup is poured into hot water, the heat sensitive liquid in the sandwich cavity will produce color changes and escape in the graphic channel of the inner cup, so that the wall of the cup shows artistic patterns, so that people can obtain aesthetic feeling and artistic enjoyment. Therefore, because the heat-sensitive liquid is in the inner layer of the cup, it is not in contact with the drink in the cup, that is, it will not cause pollution. Since this is a confined space, that volatile liquid can't get out