What is the qualitative characteristic of natural red copper?

Generally speaking, the purity of natural red copper is quite high, contain the metallic impurity such as trace tin, lead, antimony, nickel only mostly. The pure copper smelted by the original technology often contains not only more metal elements symbiotic with copper ore, such as lead, tin, zinc, iron and so on. And because the smelting temperature is not high enough, copper and slag can not be separated well, so that there will be mixed with silicon, calcium, magnesium, aluminum and other oxides.

Through the analysis of the bronze wares unearthed from the Cultural sites of the Neolithic age, such as The Qijia cultural sites in Guanghe, Yongjing and Yulen of Gansu Province, the Shaogou cultural sites, the Dongxiafeng cultural sites in Xiaxian county of Shanxi Province, and the Xiajiadian cultural sites in Chifeng city of Inner Mongolia Autonomous Region, some natural red copper products have been found.

This indicates that in the early and middle Neolithic period, there was indeed an age of copper and stone in some areas of China.

With the development of pottery technology and high temperature technology, the popularization of hot casting red copper led to the invention of metallurgical technology. From forging metal development to casting metal, and then develop to mining ore, smelting metal, which has experienced a long time.

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