The four great alchemists. From left to right: Al-Jabir (Geber 14th century Spanish) Arnald or Arnold of Villanova (French c1240-c1310) Rhazes (Abu Bakr al-Razi, 9th century Persian) and the legendary Hermes Trismegistes look down on workers in a laboratory. From Elias Ashmole 'Theatrum Chemicum Britannicum' London 1652 .

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Keywords: 17th, ages, alchemy, century, chemistry, middle, science, scientist, uk