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Public DomainHelvetius
Johann Friedrich Schweitzer (1625-1709), known as Helvetius, was a Dutch-German physician.  In 1667, he published The Golden Calf, whose strapline was How the intire Substance of Lead, was in one Moment Transmuted in Gold-Obrizon, with an exceeding small particle of the true Philosophick Stone.  The whole book is available online

Helvetius was most famous as one of the few alchemists who supposedly achieved the transmutation of lead into gold in front of witnesses.