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When we wear a mask, it's always hard for us to accurately know how long it continues to protect us because the service life of a mask will vary depending on circumstances. In response to this, we attempted to develop a type of mask that will remind people when to change it through a material and technique innovation. The color of this mask, which starts green, begins to fade as the period of wearing longer. When the whole mask surface turns white, it indicates that this mask has finished its service life and should be replaced.