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“So how do I turn lead into Gold? (PB>AU)”
You load your gun, you rob a bank. Something along these lines. (Look out when the lead comes back your way!)
These discuss a 10th century African way to remove impurities in refining gold! (Using recycled glass!)
popularized article (Easy read)
https://www.atlasobscura.com/articles/medieval-african-gold
technical article (Longer read)
https://www.sciencedirect.com/science/article/pii/S0305440314001484