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Metal residue
Answer for the clue "Metal residue ", 4 letters:
calx
Alternative clues for the word calx
Word definitions for calx in dictionaries
Wiktionary
Word definitions in Wiktionary
n. 1 (context archaic English) The substance which remains after a metal or mineral has been thoroughly burnt, seen as being the essential substance left after the expulsion of phlogiston. 2 (Now recognised as being) the oxide left after calcination of ...
Wikipedia
Word definitions in Wikipedia
Calx (From Arabic "کلس") 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 obsolete phlogiston ...
Usage examples of calx.
But all flies or sinks before fire almost in all bodies: when the common ligament is dissolved, the attenuable parts ascend, the rest subside in coal, calx or ashes.
Right up to the closing years of the eighteenth century (and in Priestley’s case a little beyond) scientists everywhere searched for, and sometimes believed they had actually found, things that just weren’t there: vitiated airs, dephlogisticated marine acids, phloxes, calxes, terraqueous exhalations, and, above all, phlogiston, the substance that was thought to be the active agent in combustion.
The most useful facet of his talent is that he transforms rocks into calxes, which are used in calculus, so the more rocks he shrinks, the more the effect of his magic grows.