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Smile Post-it Notes / packaging

Smile Post-it Notes
Smile Post-it Notes

Purchased items are often wasted because they are not used after expiration. Smile post it notes is a kind of color changing post it notes. With the passage of time, the label changes from yellow smiley face with green background to green smiley face with yellow background, which indicates that the items need to be used as soon as possible to reduce waste. It also has the function of recording.


Hubei University of Technology

Hubei University of Technology
Wuhan, China

Shiqi Yue,
Hubei University of Technology

Rui Cheng,
Hubei University of Technology