(1) Boyle knew the tin gained weight as the calx was formed.(2) Then a French pharmacist named Pierre Bayen pointed out to Lavoisier that calx of mercury, which we would now call mercuric oxide, can be converted to mercury simply by heating.(3) Other common names by which the compound is known include burnt lime, unslaked lime, fluxing lime, and calx .(4) The reason a metal formed when its calx was heated with charcoal was therefore because the phlogiston left the charcoal and united with the calx.(5) The calx combines with a flux containing phlogiston-rich materials.
