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Pouring hot liquid, the paint on the surface of the mug will change. Good choice for Valentines----GIFT. Porcelain Color Changing Mug Food safety COLOR CHANGING MUG CHARACTERISTIC: 1. When the temperature increases to 43 degree centigrade, there will be fantastic changes2. When the temperature decreases to below 43 degree centigrade, it will turns back to the original color.3. Different changes ...