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People tend to buy lots of food in the refrigerator, it is easy to cause the food deterioration or corruption. Especially us rarely to check the food's best tasted and expiration date, rotten food will make us sick. It means to ensure our body healthy while we ate foods, the other hand also reminds us food's situation, to avoid wasting food. Using special ink print on the paper. When the food began to be manufactured, the sticker have began to chemical reaction with air. Sticker color change from bright green to red, reminding people this food must be first to eat, or throw away.
National Cheng Kung University
I Jui Lee