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Nowadays milk freshness is roughly reflected by the production date on the package, however the freshness of the containing may be deteriorated by the circumstance where products is stored. Honest milk box allows customer to judge the freshness of its containing by changing its surface colour as it is designed in the same principle of colour change in pH testing. By judging the colour from package surface, customers will be able to choose the most fresh products in a more obvious way.
Jessesn Chen,XiangLan Han,YunHao Zhao,FengTian Dong