When cold persimmon is put into cold water, the temperature of water is not much different from that of persimmon skin, so persimmon can slowly bloom at this temperature. When persimmon is put into hot water, the skin of persimmon will melt first because of the large temperature change, and the ice in the pulp inside will absorb a lot of heat when it melts through the city, so the water temperature will be much lower. Therefore, frozen persimmon is easier to warm up in cold water than in hot water.