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In our daily life we often come across the expiration of milk and usually pour it away directly. But the milk just after period can wash hands and moisten the skin and the one that has gone bad can also be used as organic fertilizer for plants. This design uses RFID technology to divide a progress bar into three parts. Green stands for safe to drink; yellow stands for the milk is expired but can be used for cleaning; red means the milk has gone bad but
can still be used to irrigate plants. The colour will fade away as time goes by. We know the milk's use at the same as the present easily by observing the colour bar to make the most use of it
Wang Lei Zhan Yangyang Yang Xiao Gui Lin Li Yan Rao Yu Fu Yueming Chen Chen Fang Yao Chen Si