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The Glorious Summoner - Chapter 125
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... > In the underground kiln not far away, it was hot. A group of technicians were busy smelting Peacock stones on burning charcoals. The refined copper liquid was flowing into the molds which had long been cured through the channels on the ground. Those molds were all copper mirrors.
Seeing the peacock stones and charcoal, Xia ping ‘an’s mind settled down. This was the fire method of refining copper, a method of metallurgy that appeared in the Shang Dynasty of China.
When he first ...
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