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When we take medicine we always ignore the expiration date and eat the expired medicine. It is easy for resulting in increased illness .
We make a “warning circle” on the bottle cap.
The ”warning circle ” still display green when the medicine within the shelf life. The two substances are now in contact, and a chemical reaction is occurring when the “Warning circle” contacts with oxygen. Then “warning circle” will turn red.
“Warning circle” will alert users to prohibit the taking of this medicine. Stores also can not sell expired medicines to consumers.