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The Color Warning / toilet paper

The Color Warning

People often meet a embarrassed situation that the toilet paper put in the box is not enough.The Color Warning could solve this problem bringing the inconvenience to people.
Color warning is marked at a place that only three pieces of paper are left. In this case, it will warn people that it is time to replace the toilet paper, or you would have no paper to use.

University

Jianghan University

Jianghan University
Wuhan, China