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Fresh sticker use the principle of proliferation . Take a good control of the time and path how the diffusate spread. And the diffusate on the sticker will cover the the original green on the subcoat during the expiration date set before and turn the sticker from green to feuille morte. The diffusion process is a Physical process. The diffusion time can be set when producing the stickers, which in order to produce stickers of different shelf life.