Chapter 747: Chiyun City, Shen Residence

them. 。They just don't know that the refining method of gold uses many chemical raw materials that were not available until later generations. The reason why ancient people couldn't extract high-purit... to it. 。It's not like before, back then it could be used as medicine, well, it's kind of similar to how you improved the pills. 。"Ye Wenyan chuckled, "That's not even remotely the same. It's basical...