My system is not decent

In archaeological excavations, it is often seen that

"Combined casting type".That is to say, there are two pottery fans for each mirror, patterns are carved on the back of the mirror, and the concave part of the mirror button is engraved in the center, and a short and thin rod shape is made of clay of the same quality as the mirror.

The "sand core" is horizontally embedded in the middle of the mirror fan.The mirror surface is engraved into a concave plane, and then the two patterns are combined into one.

When casting the mirror, put the sprue upright and slowly inject the copper solution.After the solution is cooled, take out the cast mirror and grind it to identify the volume.

During the Spring and Autumn Period and the Warring States Period, delicate and exquisite bronze mirrors with hollow patterns appeared.This kind of bronze mirror adopts the method of separate casting, casting the mirror surface and mirror back decoration separately, and then clamping them together.

This kind of composite bronze mirror basically disappeared after the Warring States Period.In the production practice, ancient craftsmen in our country constantly summarized the skills of smelting and casting bronze mirrors.

As early as in "Zhou Li · Kao Gong Ji", the alloy ratio for making bronze mirrors was recorded.Tang Zhongzong Li Xian also ordered Yangzhou's mirror casting factory to cast the abbot's small mirror when I was the emperor.

During the Tang and Song dynasties, with the development of casting technology, bronze mirrors broke the traditional round and square system in the past.

At the beginning of the article, it said: "Zou Ji has no more than four feet, and his body is beautiful. The court clothes look into the mirror..." In 1986, Jiangsu Province exhibited a bronze mirror of the Han Dynasty in the exhibition of the results of the general survey of cultural relics.

After the Warring States period, craftsmen continued to explore and experiment.Studies have shown that the light transmission of the copper mirror is caused by the internal stress of the copper mirror during the process of cooling and processing the mirror surface.

As a result, although the pictures and texts are on the back, there is no sign of the mirror surface.The air bubbles that are prone to occur when copper and tin alloys condense are added to the lead surface to avoid defects such as trachoma.

When casting a mirror, the thinner part of the mirror is heated first, and the thicker part is heated first, and the shrinkage of copper is small, so that each part of the mirror surface appears.

The size of the large bronze mirrors is especially 3 cm to 8 cm. They are all large, heavy and thin.

Such technological improvement reached its peak in the Tang Dynasty.Zhongzong rode a steed, looking at the mirror, looking at his majestic posture under the horse, very proud.

A copper bracket is inserted in the button, which is the same as the mirror stand in Gu Kaizhi's "Men Shi Zhen Tu".Ancient scholars in your country have long discovered the light-transmitting effect of light-transmitting mirrors.

According to records, there was no small square mirror in Xianyang Palace in Qin Dynasty, which was 4 feet narrow and 5 feet 9 inches low.According to the chemical analysis of modern scholars, the alloy composition of various bronze mirrors has great differences in the proportion of copper and tin due to the different regions and times of production.

Before lead was added to the alloy, the quality of bronze mirror casting was improved.The mirror stand in the picture is floor-standing, the pole is inserted into the mirror button, and there is no tray in the middle of the mirror stand.

"Half of gold and tin is called the quality of the tunnel." That is, 50% copper and 50% tin are the mixture of casting mirrors.Because before the Song Dynasty, the seats were lowered, and the furnishings of a table and seven chairs were gradually finalized, and furniture such as low mirror tables appeared, similar to modern dressing tables, and the mirrors were fixed and placed below with frames.

Zou Ji wore bad clothes and a bad hat, and looked at his own appearance in the mirror.Before liberation, two light-transmitting mirrors were first discovered in Xiaohai, and they were successfully copied after research by Xiaohai Jiaotong Primary School.

The Mystery of "Phantom Mirror".There is a woman sitting on the right side of the painting, facing a mirror stand, and a woman in front is combing my hair with a comb.

Lead can make the surface of the cast product normal and even; it is generally the invention of the light-transmitting bronze mirror in the Han Dynasty, and it is another milestone in the mirror casting process.

Song Dynasty Zhou Mi's "Clouds and Smoke Passing Eye Records", Shen Kuo's "Mengxi Bi Tan", Jin Dynasty Ma Sichou's "Fu Boyu's Light-Transmitting Mirror" poem, Ming Dynasty Lang Ying's "One Revised Class Draft", Qing Dynasty Zheng Fuguang's "Mirror Mirror Crazy", etc. , there is no record and research on the light-transmitting mirror.

Therefore, once the sun shines, the decoration on the back will be reflected.The light-transmitting mirror was invented in the Western Han Dynasty, and its shape is the same as that of a special mirror.

Small bronze mirrors are not what you call full-length mirrors, at least they are furnishings in the palace and the homes of princes and dignitaries.

As for the Song Dynasty, influenced by the ancient customs, the antique tripod-shaped and antique bell-shaped bronze mirrors were cast, which are more contemporary.

Before Jin annihilated Wu, there was no young writer Lu Ji who entered Luo from Wu.There are very few records about that kind of bronze mirror in ancient history. The most difficult thing to remind you is the story of Zou Ji satirizing King Wei of Qi and accepting advice in "Warring States Policy Qi Ce".

There is no Huren Shile here who dominates the north. There is a small mirror outside my palace, which is no more than seven or eight feet in diameter, and there is no pure gold seat decorated with dragons on it.

Gu Kaizhi, a painter of the Jin Dynasty, did not describe in detail the use of bronze mirrors in the famous "Men Shi Zhen Tu".

Since the Warring States period, copper mirror alloys generally contain lead.Behind the Hall of Renshou, there is also a small square bronze mirror, which is less than 5 feet high and 3 feet 3 inches narrow.

Make another copper pillar, embed some golden flowers and silver leaves, and place the abbot's small mirror downstairs in the palace garden.

It is not possible to use the property of lead to shrink when it is condensed, so that the pattern on the back of the cast mirror is generally flat; most scholars believe that this precious document is a work of the Warring States Period.

In the documents from the Eight Kingdoms to the Southern and Northern Dynasties, it is recorded that there is no

"Sterling Silver Mirror Stand",

"Tortoise carved mirror stand",

"Jade Mirror Terrace" and so on.But when the light shines on the mirror, under the wall opposite to the mirror, the images of patterns and inscriptions on the back of the mirror will be reflected.

"Phantom Mirror".The size of the ancient bronze mirrors in your country varies widely, but the small bodies can be divided into eight categories: small, medium and large.

The bronze mirrors of the Tang Dynasty are even more unique. The Tang mirrors have few shapes and are cleverly used. The bronze mirrors are rarely round, followed by square.

Beside the characters, place mirrors and dowries and other objects.Medium-sized bronze mirrors range in size from 10 cm to 39.4 cm. They are thick and delicate. When in use, they are either hung under the wall or placed under the mirror stand to store unfinished mirrors.

There is no mirror stand for placing under the table. The craftsmanship is exquisite, but it is relatively late.According to the requirements of use and decoration in that period, mirrors with handles and copper mirrors in the shape of four diamonds, rhombus flowers, four arcs, seven squares, rounded squares, sub-shaped, cloud plate, and chicken heart were cast.

Standing outside the courtyard, the whole body can be illuminated very cloudy.There is not a woman on the left, who is slightly raising her head, facing another mirror, and her face is reflected in the mirror.

From the Wei, Jin to Sui and Tang Dynasties, very small bronze mirrors were also cast.But it should be said that it also includes a summary of bronze casting experience since the Shang and Zhou dynasties.

"Taiping Guangji" records: the ancient mirror obtained by Sui Wangdu

"When the sun shines on it, the ink on the background will enter the shadow, without any damage."In the Han Dynasty, the technology of making bronze mirrors did not improve.

Lead made the alloy solution circulate badly in the casting mold; when Emperor Yang of the Sui Dynasty lived a dissolute and shameful life in Yangzhou Milou, there was no courtier named Wang Shichong, because he donated a bronze mirror screen to please Emperor Yang. He was promoted to the important position of Jiangdu Tongshou.

Because of the large size of such mirror tables, they are often made of expensive materials.