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Time ring / Beverage bottles

Time ring
Time ring

When did I open this bottle of beverage?Can it drink?What a pity! If I throw it . But i don`t know wether drinking it will hurt the my stomach or not . A small change can let us know that this bottle of drink is in the safety of drinking period or not .when the Users opening the cap ,at the same time, the film on the plastic ring (the lower part of lid )will be removed . The plastic ring`s color will start to change gradually . And people can observe the plastic ring`s color to judge that the beverage is in the safety of drinking period or not .


Guizhou University

Guizhou University
Guiyang, China

Hua Cao Tuo Wang Mengdi Shi Tao Hu