| In the 18th century, oxides were named calxes or calces after the calcination process used to produce oxides. |
| Its calces are white when imperfect, but black, or dark green, when perfect. |
| Metals then were regarded as compounds of calces and phlogiston. |
| It may be resuscitated, like the calces of Antimony, into a Regulus, by re-uniting it with a phlogiston. |
