Tract on the Tincture and Oil of Antimony: The Universal Medicine - Tapa blanda

Roger Bacon is known for his many works, dealing not only with chemical matters but grammar and optics as well. This particular work revolves around the use of alchemy in medicine, specifically the use of antimony and lead. This would directly inform later works such as "A work of Saturn" by Hollandus. The use of malleable, antimonial compounds in medicine would continue for centuries, and according to Roger Bacon it is this universal elixir which comprises the highest tier of the alchemical art.