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This series of crispers are made of color-changing material which is temperature sensitive.
Crispers is the tool used to keep food fresh. But some problems still exist for crispers cant provide information about the time used. People tend to forget about the crisper which is kept in fridge for a long time, in which the food is already rotten.
Our crisper will become light pink to dark red during its storage. After picked out of fridge, the material turns to transparent again, just like the way of color-changing sunglass.
Hui Lin Haolin Xuan Jia Wu