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Visual shelf life / Resource saving additiona

Visual shelf life

It's a product that reminds people of the shelf life of an item after they start using it. This is a reminder that the use of the goods as soon as you start
to use shelf life of products. To use color striking visual reminder of the product (eye drops) whether can continue to use.

University

Chongqing University

Chongqing University
chongqing, China

yaqiong 杨,
Chongqing University