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In the daily life,we often encounter the embarrassing situation that we can't distinguish which cups are ourselves's at the party, but also can not tell if someone cup is used or not.Lable Mine is able to solve these problems.It adopts the material of an ink which will change the colour when it encounters the water.This ink is white usually, but it will become transparent when it encounters the water.
Qinhuangdao City of Hebei Province, China