HgS: black → red

HISTORYAlchemy's great work ran from nigredo (blackening) through albedo and citrinitas to rubedo (reddening), a sequence Newton copied in his alchemical notes (see Solve et Coagula). LITReal chemistry sits under the red/black: grinding quicksilver with sulfur gives black HgS (metacinnabar), and sublimation and heating convert it to red cinnabar, which is vermilion (Vermilion, Quicksilver Beads). The cinnabar ⇌ metacinnabar transition is near 344 °C (from memory). COMPUTEDThe mass balance is exact from atomic weights. Heat the crucible.

heat °C

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