Why can't I wear a black mask?

Most of the black masks on the market are due to the addition of activated carbon. After adding activated carbon, the mask appears black. Activated carbon masks are mostly used to prevent odor, dust and pungent odor. It can be used in chemical plants, leather factories and daily dust prevention, but it has no effect on blocking novel coronavirus.

At present, according to different people, scenes and risk levels, it is suggested to wear disposable medical protective masks, medical surgical masks, N95 or KN95 masks in order to cut off the transmission route of respiratory droplets in novel coronavirus.

History of mask development

China is the first country in the world to use masks. In ancient times, in order to prevent dust and respiratory pollution, people in the court began to cover their mouths and noses with scarves. For example, Li Shu said, "Cover your mouth, you are afraid of meeting someone." "Mencius Li Lou" Note: "If the calligraphy is unclean, everyone will cover his nose." It is very unsanitary to cover your nose with your hands or sleeves, and it is inconvenient to do other things. Later, some people covered their mouths and noses with a piece of silk.

Kyle Poirot described his 17-year experience of living in China in his book The Travels of Marco Polo. One of them said, "In the palaces of the Yuan Dynasty, people who offered food covered their mouths and noses with silk to let them breathe and not touch the food." This silk cloth covering the nose and mouth is also the original mask.