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When the cup is not yet filled with water is gray, his pattern cup mounted hot water over there, with the height of the heat of the water change color encounter hot water when the water temperature reaches a certain heat, cup pattern partbecomes red, the pattern will be the height of Iraq according to hot water to change along with the red, the cup will return to the original gray rinse in warm water when the water is drained.
Hsiuping University of Science and Technology