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This kind of package uses the printing principle of automatic fading ink so that the spots on the cows on the packing box will slowly fade away as time goes by and finally disappear into a label in violation of cognition - cows have no spots, thus not only making consumers pay attention to the expiration date on the packing box, but also facilitating clerks to dispose of the expired milk.
University of Electronic Science and Technology of China,Zhongshan Institute