黃帝九鼎神丹經訣
硝石水法

硝石水法

硝石水法

取硝石擣篩，鹽水漬之令浥浥，納竹筒中，密固口，埋地中，入土四寸，五日成水。疑是入土四尺四寸，臨事兩試之。

End of chapter
殺鐵鏵精毒法青礬石水法

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

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