Copper, through thousands of years, the vicissitudes of life, still do not abandon.
Copper, after thousands of years, is still along the way.
In 1965, a sharp sword unearthed from the tomb of the Chu nobility in Hubei Province was proved to be Goujian's sword in the Spring and Autumn Period. The sword of King Yue was buried deep in the ground. When it was unearthed, it was still bright as new and cold. Why could the sword after thousands of years still shine with cold and no rust?
(Goujian Bronze Sword, King of Yue)
In the Eastern Zhou Dynasty, according to Kao Gong Ji, the bronze swords of Wu and Vietnam were exceptionally sharp and famous. Ouyezi, cadre generals and Moxie are all outstanding swordsmen in Chinese history. Its casting technology and practical value can be regarded as the glorious peak in the history of Chinese sword casting.
(The pattern is still distinct)
King Yue Baojian is the masterpiece of Ouyezi, the founder of the sword. The main component of the sword is bronze alloy. Sword ridge contains more copper, which can make the sword tough and not easy to break. Sword bronze alloy has higher hardness and sharper blade than tin, and copper sulfide can prevent rust to keep the pattern bright.
Thus, it is precisely because of the unique properties of copper that the sword will last forever. Bronze swords are the most outstanding weapons in ancient China, and have the greatest prestige in the world. In fact, there are not only swords, but also numerous copper miracles in history.
Archaeologists have found copper pendants in northern Iraq in 8700 B.C., which are still shining with metal despite dust; a copper pipe in the Egyptian pyramid, though flowing through 5000 years, can still flow in a clear stream; the "Simuwuding" of 3500 years ago, the Shang Dynasty surface patterns and patterns of bronze casting are still distinct and discernible...
(Simu Wuding)
These historical relics have witnessed the glorious past of copper. In modern times, copper also plays an important role. Copper water falling system, copper doors, copper walls, copper roofs (copper spires) and other copper decorations and buildings are in the same place, with strong ancient charm and unique historical charm.
(Copper curtain wall)
(Copper chimney cap)
Over time, they have been oxidized into primitive green, telling about the ancient history.
（Copper drainage）
The white foal changes rapidly through the gap. What remains unchanged is the existence of copper, which has gone through thousands of years without extinction.
