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Food Fresh Crackter is a brand-new design to solve this problem.It contains materials with different capability of absorbing water. These materials becomes rigid while the rigidity depends on the amount of water they have already abosorbed.In this way, can show the length of time food has been stored,which can tell the freshness.The blind could avoid eating these food by using it, so that they would not get ill or die from these food.
Wuhan, China, China