Yù dòng dà shén dān shā zhēn yào jué 玉洞大神丹砂真要訣
True Essential Instructions of the Great-Spirit Cinnabar from the Jade Cavern
attributed to 張果 (Zhāng Guǒ) — Táng Daoist alchemist, one of the “Eight Immortals”
A Táng alchemical instruction-text on cinnabar (dān shā 丹砂) attributed to Zhāng Guǒ (Zhāng Guǒ lǎo 張果老), the famous Daoist of Táng Xuán zōng’s court and one of the legendary Bā xiān 八仙 (“Eight Immortals”). The text is dated to 734 (Kāi yuán 22). Preserved as DZ 896 / CT 896 (Dòngshén bù, Zhòng shù lèi 洞神部眾術類).
Dating. 734. Dynasty: 唐.