Fulcanelli
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The appeal of Fulcanelli as a cultural phenomenon is due partly to the mystery of most aspects of his life and works, and his disappearance. In particular, he is reputed to have twice performed a transmutation of lead into gold. The first was in 1922, together with his most devoted pupil Eugène Canseliet, when the two supposedly performed a successful transmutation of 100 grams of lead into gold in the presence of Julien Champagne and Gaston Sauvage. This demonstration took place in a laboratory of the gas works of the Georgi company at Sarcelles, and was achieved with the use of a small quantity of "Projection Powder" (also known as the Philosopher's Stone) prepared by Fulcanelli. The second was in 1937 at the Château de Léré, when Fulcanelli supposedly performed a transmutation of 225 grams of lead into gold and 100 grams of silver into uranium before witnesses including a chemist, two physicists and a geologist. After this, Fulcanelli disappeared completely. Provided by Wikipedia