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Normally there is a sticker on the package of raw food, informing the expired date. However, the date is set based in an optimal storage situation. If power cut occurs in the supermarket which affects the freshness of the food, the customer would not know. So we design a fresh sticker, which detects the storage environment, and shows the freshness by color changing from white to black. While the raw food becomes rot, the sticker will turn black, covering the barcode.
Dalian Polytechnic University
Fan Yang, Jinghan Shi, Xing Jin