Congelation (fromLatin:congelātiō,lit. 'freezing, congealing') was a term used in medieval and early modernalchemy for the process known today ascrystallization.[1]
In theSecreta alchymiae ('The Secret of Alchemy') attributed toKhalid ibn Yazid (c. 668–704 or 709), it is one of "the four principal operations", along withSolution,Albification ('whitening'), andRubification ('reddening').[2]
It was one of the twelve alchemical operations involved in the creation of thephilosophers' stone as described bySir George Ripley (c. 1415–1490) in hisCompound of Alchymy,[3] as well as byAntoine-Joseph Pernety in hisDictionnaire mytho-hermétique (1758).[4]
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