Judging by color usually, what we see is a blue medical copper mask, the blue side is the outside, and the light (white) side is the inside (face). I have listed the characteristics of several common disposable masks. After determining the above conditions, let us determine which side is the outside and which side is the inside. How to distinguish the front and back of the mask So how to distinguish the front and back of the mask? First, distinguish the top and bottom, the metal strip is on the top, because the metal strip can be used to adjust to fit the nose. This will cause saliva to adhere to the surface of the mask, and the more saliva accumulates, it may wet the mask and make the mask lose its filtering function. If worn back, the water-absorbing layer will become a waterproof layer, and the waterproof layer will become a water-absorbing layer. The filter layer for filtering bacteria is located in the middle, the outer layer is a waterproof layer, and the inner layer is a water-absorbing layer. The front and back of the copper mask have different functions. How to distinguish the front and back of a copper mask? Why do we correctly distinguish the front and back of the mask? Many people may think that as long as you wear a Shishi, the front and back are the same.
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