| 摘要 |
PURPOSE: A milk container is provided to enable a user to safely drink milk by enabling the user to effectively determine the freshness of the milk. CONSTITUTION: A milk container effectively informs the expiration date of milk. The color of the milk container is eliminated according to the time by using ink including thymolphtalein solution. The color is eliminated according to the flow of the time when the ink is touched with oxygen. A user is able to know the expiration date by controlling the amount of ink.
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