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jingxia Hu / Fresh-keeping cap for milk

jingxia Hu

and same with ordinary milk bottle tops, just tear bottle seals can open bottles.At the same time,the new blue material begins to oxidize,and start timekeeping。As oxidation more long, coleor changes,until become red.it explain the milk in bottles which is too long time in opened cannot drink.

Design

Zhejiang University City College

Zhejiang University City College
Hangzhou, China