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We often spend much time searching for the quality guarantee period and the manufacturing date, which are hard to be found because they are always in the different place of the bottle. This is a design about bottle cap. It has a working life, with the time goes by, it will be oxidized to be changed its color. The color can remind people of storage time of the drink, which will provide convenience to one’s choice. When the color change into brown, it indicates that the drink is undrinkable.