Calx is a substance formed from an ore or mineral that has been heated. Calx, especially of a metal, is now understood to be an oxide . The term is also sometimes used in older texts on artists' techniques to mean calcium oxide .
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1-576: According to the obsolete phlogiston theory , the calx was the true elemental substance that was left after phlogiston was driven out of it in the process of combustion . Calx is Latin for chalk or limestone , from the Greek χάλιξ ( khaliks , “pebble”). (It is not to be confused with the Latin homonym meaning heelbone (or calcaneus in modern medical Latin), which has an entirely separate derivation.) This inorganic compound –related article
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