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When we wear a mask, it's always hard for us to accurately know the effective protection period of it, because when we are in different environment, the service life of a mask will vary. We try to develop a type of mask that can remind people when to change it through material and technique innovation.
The color of this mask can fade. Overall, it is green. As the wearing period gets longer, the area on the mouth and nose (the center of the mask) starts to fade into white. When the whole mask surface turns white, it indicates that this mask has finished its service life and should be changed.