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At the party,we always took a cup of Cocktail from waiter.
But, waiter didn't know which cup sjould be taken when cleaned up the table.
It's the reason why, we put the temperature paint on the handle.
When the cup didn't be took for a while, the handle is going to light a little light.
To help waiter recognized and cleaned.
Tatung University
Taipei, Taiwan
Tatung University
Taipei, Taiwan
Pei-Chun Liao