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Guthrie Stewart has studied chemistry and worked in laboratories and factories. Thus when he took up medieval re-enactment, alchemy was an obvious topic to research.
Waiting only until he had his own back garden in which to practise, he has spent the last 7 years carrying out experiments based on real medieval alchemical texts, and studying the history of alchemy and chemistry, amazed at the recipes and the marvellous results. He also reads a lot of fiction and non-fiction.