Английская Википедия:Caput mortuum

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Файл:Caput mortuum.svg
Alchemical symbol for caput mortuum

Caput mortuum (plural capita mortua) is a Latin term whose literal meaning is "dead head" or "worthless remains",[1] used in alchemy.

Caput mortuum (alternately called nigredo) signified a useless substance left over from a chemical operation such as sublimation and the epitome of decline and decay; alchemists represented this residue with a stylized human skull, a literal death's head.[2]

The symbol shown on this page was also used in 18th-century chemistry to mean residue, remainder, or residuum. Caput mortuum was also sometimes used to mean crocus metallorum, i.e. brownish-red metallic compounds such as crocus martis (ferrous sulfate), and crocus veneris Шаблон:Chem name.[3]

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