User:NNU-11-22100502/Kai yuan Tong Bao

Kai yuan Tong Bao diameter of eight points, two baht, accumulated ten money for one or two, Millennium money to four kilograms of 42. Because a pound heavier than a pound in Western Han dynasty 1 time in the Tang dynasty more than doubled, so the Kai yuan Tong Bao heavier than Western Han Wu Zhu coin money. Kai yuan Tong Bao money creation and Qin Liang and Han Wu Zhu coin money, is China's currency is of epoch-making significance in the history of the event. At this point, the Mint officially divorced from the weight of metal to coin the name system, called "Tong Bao", "Acer truncatum Bunge". From then begins, for money French no longer in baht terms (before Tang dynasty is baht, 24 baht to one or two are 24 carry) but instead two, money, points or interest of decimal scale, a 3.73 g, means Kai yuan Tong Po penny weights, ten Kai yuan Tong Po equals one or two. Kai yuan Tong Po as moderate severity, its size name form expedient, and and innovation on Chinese currency has far-reaching impact. It is not only the main currency in circulation in the Tang dynasty as a whole, and become a role model for copper coins of the Tang dynasty more than 1000 years later. Ming and Qing dynasties are made by its shape, Southern Tang and five dynasties in Fujian and has cast Kai yuan Tong Bao.

Tang Kai yuan Tong Po gold silver, large copper and lead various material of money and small layout no less than hundreds. Tianbao years money furnace has most of the Tang dynasty there are 49, at that time provided copper coins of the ingredients are copper 83.32%, ash 14.56%, black lead 2.12% used in each of the copper 21,200 kg, ash 31,700 kg, 500 kg of Tin. Casting both inside and outside money at first, Tang Guo neatness and the back flat and smooth, calligraphy and the importance to the work is people, not only useful, and a high ornamental value. A great poet Du Fu's poem "capsule space-strapped to retain money", that is the Tian Yuan Tong Bao.