丹房須知
取土六

取土六

取土六

火龍經曰：葛仙翁云：修煉之器，壇爐之土，並須潔淨。司馬氏云：神室之土，不可以凡土爲之。自古無人跡所踐之處，山巖孔穴之内，求之，甞其味不鹹苦，黄堅與常土異，乃可用也。

End of chapter
丹井五造炭七

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

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