大洞鍊真寳經九還金丹妙訣
證品含元章

證品含元章

證品含元章

大洞錬真寳經，皆隱袐真鉛真汞。真汞之訣者，則上品光明砂中抽得汞，轉更合内水火之氣，然名爲真。而光明砂一斤，其中含汞十四兩。

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大洞鍊真寳經九還金丹妙訣抽砂岀汞品第一

Text and scans: Shidian Guji (Peking University – ByteDance open ancient texts). Edition details are given per book. Shidian Guji

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