Calx

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Calx is a residual substance, sometimes in the form of a fine powder, that is left when a metal or mineral combusts or is calcinated due to heat.

Calx, especially of a metal, is now known as an oxide. According to the phlogiston theory, the calx was supposedly the true elemental substance, having lost its phlogiston in the process of combustion, but this theory has been disproven.

"Calx" is also sometimes used in older texts on artist's techniques to mean calcium oxide.

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