Medieval alchemist
As an alchemist you would spend years tending a furnace and decoding riddling texts, convinced that matter could be perfected – and that lead, in principle, could become gold.
The theory of transformation
Medieval European alchemy drew on Greek philosophy and, above all, on Arabic works translated into Latin from the 12th century onward. Its theory held that metals were made of principles – often described as sulphur and mercury – combined in different proportions, and that all metals were ‘ripening’ towards gold in the earth. The alchemist’s goal was to speed this up with the philosopher’s stone, a substance that would transmute base metals and, some believed, also heal the body as an elixir of life.
In the laboratory
Day to day, alchemy was hands-on work. Alchemists built furnaces, including the athanor for long, steady heating, and used alembics, retorts and crucibles. They dissolved, calcined, sublimed and distilled, watching colour changes – blackening, whitening, yellowing, reddening – that were thought to mark stages of the Great Work. Texts were deliberately obscure, full of symbols, code names and allegorical images, partly to guard secrets and partly because the work was also seen as spiritual purification.
The practice was often expensive and dangerous: mercury, arsenic and lead compounds were everyday materials, and fumes and explosions were real risks. Rulers both funded and distrusted alchemists, and Pope John XXII condemned fraudulent alchemy in 1317.
Gifts to chemistry
No one made gold, but alchemists refined laboratory techniques, improved distillation – producing strong alcohol and mineral acids – and accumulated knowledge of substances that later chemists used. Polish lands produced a notable figure: Michał Sędziwój (Michael Sendivogius, 1566–1636), working at the courts of Sigismund III and Rudolf II, wrote influential texts and is credited by some historians with ideas about a life-giving component of air.
