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Opus alchymicum


Opus alchymicum, or opus, sometimes called the "work," is the alchemical process of transmuting cheaper metals into more precious ones. Initially the opus alchymicum had four stages: the nigredo (black), the albedo (white/silver), the citrinitas (yellow), and the rubedo (red/gold). After the fifteenth century references to the citrinitas stage were gradually phased out leaving the opus alchymicum with three main stages. A.G.H


Sources:

Drury, Nevil. "Opus, Stages of the" The Watkins Dictionary of Magic. London. Watkins Publishing. 2005. pp. 218-219