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In page Carl Wilhelm Scheele:

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While Scheele's experiments generated substances which have long since been found to be hazardous, the compounds and elements he used to start his experiments were dangerous to begin with, especially heavy metals. Like most of his contemporaries, in an age where there were few methods of chemical characterisation, Scheele would smell and taste any new substances he discovered.[2] Cumulative exposure to arsenic, mercury, lead, and their compounds and, perhaps, hydrofluoric acid, which he had discovered, as well as other substances, took their toll on Scheele. He died at the early age of 43, on 21 May 1786, at his home in Köping. Doctors said that he died of mercury poisoning.[citation needed]