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Pico della Mirandola's mention of transmutation

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I come now to declare that which I have beheld of this prodigy, without veil or obscurity. One of my friends who is still living has made gold and silver over sixty times in my presence. I have seen it performed in various manners, but the cost of producing the silver with a metallic water exceeded the value of the produce.

From Giovanni Pico Della Mirandola. De auro libri tres... Venice 1586.