Metals then were regarded as compounds of calces and phlogiston.
Its calces are white when imperfect, but black, or dark green, when perfect.
All the calces of Antimony, when exposed to a violent fire, are converted into Glass; but not all with the same facility.
It may be resuscitated, like the calces of Antimony, into a Regulus, by re-uniting it with a phlogiston.
n. pl. calx·es or cal·ces (kāl'sēz')
The crumbly residue left after a mineral or metal has been calcined or roasted.
The posterior rounded extremity of the foot; the heel.