Yīn yáng jiǔ zhuǎn chéng zǐ jīn diǎn huà huán dān jué 陰陽九轉成紫金點化還丹訣
Instructions on the YīnYáng Nine-Cycles Forming Purple Gold for Transmutation into the Return-Elixir
Anonymous; late Táng / early Sòng
A short alchemical instruction-text on the “purple-gold transmutation” return-elixir (zǐ jīn diǎn huà huán dān 紫金點化還丹) — a nine-cycle elixir produced by alternating yīnyáng firing phases. Preserved as DZ 895 / CT 895 (Dòngshén bù, Zhòng shù lèi 洞神部眾術類).
Dating. Late Táng or early Sòng (10th century?). Dynasty: 唐-宋.