Usually the cup is made of plastic, two layers of glass wall separated by liquid, the liquid can not be removed, frozen after putting into the refrigerator, used as a cooling agent for drink in the cup, for enhanced aesthetics, usually colored liquid.
The color of the liquid after icing is slightly lighter, and the color gradually recovers during the melting process. To protect the cup, the liquid in the compartment is not filled, and consumers do not have to buy too much liquid cups.
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