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Test paper is blue (alkalinity) before using the wrap. When food are put in the refrigerator, moisture will solidify on the wrap because evaporate. The test paper contacts the moisture will turn red (acidity) if the food was rotten.
DaYeh University
Changhua, Taiwan
Mi-Cian Huang,
DaYeh University
Yi-Fan Chang,
DaYeh University
Hsu-Tzu Cheng ,
DaYeh University