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The cover of Apple Mask is made of a special color-changing material, which gradually changes as it begins react to oxygen the temperature of the human skin. When an Apple Mask is used for more than three days, it changes into a color and even shows a crying face mark that humorously indicates it is ‘perishing’ to remind the user to change the mask. It is common for people to forget about changing their masks. According to medical studies, when masks are used for a long time, bacteria tend to grow which leads to respiratory tract infection. In severe cases, the masks lost the ability to filter pollutants.
China Academy of Art