Tōng xuán mì shù 通玄祕術
Secret Techniques for Communicating with the Mystery
by 沈知言 (Shěn Zhīyán) — late Táng Daoist alchemist
A late Táng / Five-Dynasties alchemical instruction-text on esoteric techniques for “communicating with the mystery” (tōng xuán 通玄). An earlier version attested to the late 9th century. Preserved as DZ 942 / CT 942 (Dòngshén bù, Zhòng shù lèi 洞神部眾術類).
Dating. Late 9th / early 10th century. Dynasty: 唐-五代.