Rasahridayatantra 2.1

Steaming, trituration, swooning, resuscitation, distillation, confinement, and restraint; / kindling, the measure of swallowing mica, and the procedure of assimilation;

internal liquefaction, external liquefaction, calcination, coloring of mercury, and transmutation flowing; / penetration, transmutation, and ingestion: thus the alchemical operation is eighteen-fold.