  As an alchemist, Ge Hong experimented with drugs and minerals. The “Gold Elixir” (Jin dan 金丹) and “Yellow and White” (Huang bai 黄白) chapters of the Baopuzi neipian survey the history of alchemy and describe in detail a method for “alloying cinnabar,” quoting from ancient recipes and “cinnabar methods.” The “Immortal Herbs” (Xian yao 仙藥) chapter gives information on medical herbs (Gao 1996, Qing 1994, Theobald 2013).