The most popular package that can display temperat

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Packaging that can display temperature and time

the French "No.2 price" supermarket chain is using a packaging with a "cow eye" label on many fresh foods, which can display the temperature and time of food storage. This kind of label is like a target for shooting. It has a transparent ring with many traps. The central ring contains a chemical substance. This chemical will increase with the temperature and time. When the inner ring turns black, it means that the food is no longer fresh

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