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This new type of mask uses a special material on its surface, which helps block the virus while displaying the amount of virus in different shades of color. At first it presents a light color; as the amount of virus increases, the color gradually becomes darker, realizing "visualization" of the virus.
People tend to ignore the existence of viruses because they cannot be seen. The "visualization" of virus reminds them to consciously wear masks for self-protection. After the mask is used, the visible virus warns people not to touch the surface of the mask with their hands, and to handle used masks safely and normatively.