How to distinguish the front and back of a mask ?

         The front and back of the mask should be dark outward and light inward;If there is no color distinction, you can judge according to the fold, the fold downward for the outside, the fold upward for the inside;It can also be distinguished by the binding surface of the earband and the mask. The binding surface of the earband and the mask is the inner one.When wearing the mask, the nose clip should be turned up, the arc of the mask should be unfolded, and the ear strap should be fixed on the ears.  

1, color judgment method

In general, the most common masks are blue. We can distinguish the inner and outer sides of the mask by the color of the mask. The darker side is the outer side of the mask, while the lighter side is the inner side of the mask.

2, pleated judgment method

The inner and outer sides of the mask can also be judged by the folds of the mask. In general, the fold facing down is the outer side of the mask, and the fold facing up is the inner side.

3, ear band judgment method

You can also judge the front and back of the mask by the ear strap. Take a careful look at the mask. The welding surface between the ear strap and the mask is generally the inside side, and the side that can not be seen connecting the ear strap and the mask is the outside side.

       Mask is a kind of protective tool that plays the role of filtering. Generally, the mask uses a multi-layer filter device to filter out polluting gases, bacteria and tiny particles in the air, which plays a good role in protecting people. However, common dust masks, cotton masks and the black masks often worn by celebrities are mainly used to protect against wind, dust and privacy. They cannot be used to protect against viruses and bacteria. If you are going to the hospital or to prevent virus infection, you need to wear a medical mask or disposable surgical mask.