With the development of skills, the cost of mirrors has declined. With the emergence of various curved mirrors, mirrors have been widely used, and have more uses besides lighting appearance. For example, the spherical rear-view paraboloid mirror used in automobile, the paraboloid mirror used for assembling in telescope and reflecting parallel light in searchlight, etc. The modern mirror was made by means of the method created by the German chemist rebig in 1835. Silver nitrate was mixed with reducing agent to separate silver from silver nitrate and attach it to glass. The commonly used reducing agent is sugar or potassium sodium tartrate tetrahydrate. In 1929, pilton's friends in England improved this method by successive silver plating, copper plating, painting and boring techniques.

    According to legend, the first mirror used by mankind was made by Momu. At that time, people in the Yellow Emperor's palace often stood at the water's edge, shining their own faces, dressing up. Mo's mother felt that she was ugly, so she didn't go to the water to make up and dress up. She didn't show up at will during the festival. All I know is to work around the Yellow Emperor. Once, Tongyu asked his mother to go up the mountain with her to dig stones. Without saying a word, she accompanied her up the mountain. Momu's strength was great, and she dug the stone faster than other women. It cost more than 20 yuan less than half a sound. At this time, the sun is reasonable noon, and the sun shines on the earth. Momu suddenly found a piece of shining stone in the pile of stones. The sunlight was very striking. Mo Mu bent down and dug it out of the ground with her hands. She took it in her hand and saw it. She was shocked. What kind of monster is this? 

    His ugly face is all on this piece of stone. Even she felt strange! She hid this piece of stone quietly and went back to the Yellow Emperor's palace without telling anyone about it. When there was no one around, she took out the stone again and found that the plane of the stone was uneven. The face reflected on it was grotesque. Mo Mu went to the workshop where stone knives and axes were made. She found a grindstone and pressed it on it. After a long time, the surface of the stone was completely smoothed. She used it to take a picture, and the analogy was much clearer. Only my appearance is still so ugly. She grinded for a while, picked it up and photographed again. She was still ugly. Mo Mu murmured to herself: "it seems that the ugly face can't blame the stone (mirror)." From then on, Momu never went to the river or the water to make up. Every morning, according to the stone, tidying up to dress up, and then quietly hide. As the time went on, mom became careless. On one occasion, Momu helped Tongyu cook meat on a stone slab. Due to the excessive fire power, the stone plate was burned and exploded. A piece of broken stone debris flew up, which broke Momu's face and kept bleeding. Mo's mother hurried back, took out the stone, and put medicine on her face. However, the Yellow Emperor did not know when he would come back. After his mother died, he found that his mother was holding something in one hand and sticking medicine to her face. The Yellow Emperor went to Mo's mother. After her death, her head was close to her arm. 

    Just as she was about to watch carefully, Momu exclaimed. She found that Huang Di's face appeared on the stone. When she turned her head, she knew that the Yellow Emperor was standing after her death. "What do you have in your hand?" the Yellow Emperor asked his mother After listening to the Yellow Emperor's question, the kind and loyal mother knew that he could not deceive the Yellow Emperor and knelt down in front of him with a thump. Mo mother told the Yellow Emperor from the beginning to the end of the discovery of this piece of stone that could be taken as a picture, and begged the emperor to forgive her. After hearing this, the Yellow Emperor burst into laughter, took his mother in his hands and said, "this is a great discovery for you. You are not only right, but also have made a great contribution!" the Yellow Emperor said, and immediately called Leizu, fanglei and Tongyu to take out this piece of stone that can show people's face, and call on her three wives and families to be intelligent. Leizu said with a smile: "Yellow Emperor, no wonder for a long time not to see my mother go to the water to make up. She had this treasure." Tongyu then said: "Huangdi, this discovery should be a credit to my mother and younger sister!" the Yellow Emperor excitedly said, "of course, we should remember one merit!"