Sign up for an Award
Participate with your entry in one of our professional or student awards.
Sign up for an awardLearn more:
Unsupported browser
You are using an outdated browser. Please upgrade your browser to improve your experience.
The test paper is blue (alkalinity) before using the wrap. When food is put in the refrigerator, due to evaporation, moisture will appear on the wrap. The test paper comes into contact with the moisture and will turn red (acidity) if the food is rotten.
DaYeh University
Changhua, Taiwan
Mi-Cian Huang,
DaYeh University
Yi-Fan Chang,
DaYeh University
Hsu-Tzu Cheng,
DaYeh University