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People tend to buy lots of food in the refrigerator, it is easy to cause the food deterioration or corruption. Using special ink multi layer print the sticker paper, begin from food to be made, this sticker have began to chemical reaction with air, the pattern will from smile to cry. When you buy a food back home, you can see the sticker's pattern to check the food's status. It means to ensure our body healthy while we ate foods, the other hand also reminds us food's situation, to avoid wasting food.
National Cheng Kung University
I Jui Lee