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to test for a metamorphic / articles for daily use

to test for a metamorphic

People often open the drinks the place but not for a long time did not drink, but when they want to drink again but do not know to have expired, if the metamorphic drink it will be a health hazard Shake, a bottle of drink contact soft rubber cap at the top of the discoloration, when drink metamorphic produces a large number of bacteria, can make the soft rubber discoloration (similar with PH paper reaction), warning people cannot drink.

University

China Academy Of Art

China Academy Of Art
HangZhou, China