Glass of antimony, vitrum antimonii, is a yellow to red, translucent glass created from a preparation of antimony, though historically used as an emetic, the glass was a subject of much interest from alchemists due to its unusual properties.
It was created using crude antimony, ground and calcined by a vehement fire, in an earthen crucible, until it no longer fumed, indicating that its sulfur was evaporated.
The remaining substance (antimony trioxide) was then vitrified in a wind furnace, and stirred with an iron rod, upon which it became translucent and displayed a ruddy and shining yellow-red color.
Yet, if dissolved in spirit of urine, it ceased to be either emetic or cathartic.
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