On October 6 in 1807, the wild experimenter Sir Humphry Davy first produces and discovers potassium. He is only 18, working in his own lab in the recently founded Royal Institution in London. In a chance experiment, Davy passes an electric current through molten potash and lavender flames burst forth as potassium is released and contacts the air. "Capital experiment!" writes Davy in his notebook. Several days later he becomes the first to produce sodium using a similar apparatus. Through his fabled career, Davy was known for having chemistry experiments explode, and for producing gases that he inhaled recklessly.
—from The Illustrated Almanac of Science, Technology, and Invention