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Nowadays, people are increasingly concerned with the safety of food. As a result, it has been a problem to identify and avoid eating expired food.
Using a new printing technology that the printing color would change with time going by, we have a new kind of barcode. It will reveal "expired" in time, which makes the shelf life alert visual. Thus, it is easier for people to be aware that whether the food expire or not. Even though people have selected the expired good carelessly, they cannot purchase it because the code is interfered.Meanwhile, it is also convenient for the stores to discover the expired goods.