Shàng dòng xīn dān jīng jué 上洞心丹經訣

Instructions on the Upper-Cavern Heart-Elixir Scripture

Anonymous; Northern Sòng

A Northern-Sòng Daoist alchemical instruction-text in 3 juàn on the upper-cavern heart-elixir (shàng dòng xīn dān 上洞心丹) — an inner-alchemical (nèi dān 內丹) formulation centered on the heart. Preserved as DZ 950 / CT 950 (Dòngshén bù, Zhòng shù lèi 洞神部眾術類).