Chongning Tongbao was first cast in the Chongning period (1102-1106) of Zhao You, Huizong in the Northern Song Dynasty. There are three kinds of treasures: Chongning Tongbao, Chongning Chongbao and Chongning Yuanbao. Chongning Tongbao Dang type 10, Qian Wen is Huizong's relative book, so it is imperial book money. The Qian's handwriting is delicate and thin, with a silver hook drawn by iron. It is the true manifestation of Zhao You's thin gold style of Huizong that remains in the world. Huizong of Song Dynasty had excellent coinage. At that time, the official color was 96%-96.7%. It was higher than Chongning Chongbao and Chongning Yuanbao. He was also called "the two saints of money law" with Wang Mang, and was one of the two most valuable coins in bronze coins.
The money is thick, bronze, rusty and old, open the old pit. The reason why it is called the big-character version is that the four characters of Qian Wen are full and close to each other. "Bao, Ning" has a long and left-leaning crown, while "Chong", "Ning" and "Tong" are the same as "Chong Ning Tong Bao", which is widely recognized as the word of "Chong Ning Tong Bao". In addition to a slightly smaller diameter of money, the outline is narrow, the size of perforation, and the color is basically the same.
In the smelting process, "bile water smelting copper" has formally become a practical method of copper production. In the second year of Chongning (1103 A.D.), the total output of bile copper reached 1874427 kg, accounting for about 12% of the copper output at that time. After the Song Dynasty, the copper output of 14 states in the south of the Yangtze River declined sharply, while the output of bile copper in Qiandao was still 210,000 jin, which accounted for 80% of the total copper output in the Southern Song Dynasty. So people in the Song Dynasty attached great importance to the production of gallbladder copper. Zhang Jia of the Southern Song Dynasty wrote a Book "Brief Introduction to Copper Immersion", which recorded the production of gallbladder copper at that time. As for the specific operation of leaching gallbladder copper, Song Shi Die Goods Records recorded that pig iron was sliced and discharged into a tank containing gallbladder water, soaked for several days, and then scraped out muddy copper (called "red coal") and smelted in a smelting furnace. At that time, about one kilogram of copper could be obtained for every two kilograms of iron, and the technical level was quite high. In addition, at that time, there was also the "leaching copper method" of decocting copper with gallbladder earth. The basic principle was the same as the "gallbladder water method". This method was "more work and less profit", but "its soil is infinite, if it is thicker than copper ore, its benefit is already thick", so it was also widely used.
The Song Dynasty was a highly developed period of smelting and manufacturing technology in the history of the Chinese nation, with exquisite coin casting technology. Among them, Chongning Tongbao is the most!Chongning Tongbao is rare in the world. According to what we can see at present, Quanjia commented, "Fan is one and all in one, or beautiful hairpin flowers, natural graceful, or like Tiansun Brocade, with beautiful literary style." Whether it is the exquisite writing of money or the fineness of casting, it is a fine work of art.