Bruno, Giordano – On Magic - The Metals and transmutation
Type of Spiritual Experience
I don't know which method he used so I have listed all the possibilities
A description of the experience
On Magic – Giordano Bruno
While bronze is more similar to gold and is closer to the distinctive properties of gold than are the ashes of bronze, still, in a transmutation, these ashes of bronze are closer to the form of gold than is bronze.