Not too mysterious any more. A professor at MIT who is in both archeology and materials science at MIT reproduced it.[1] Copper, silver, and about 15% gold. Unf

Not too mysterious any more. A professor at MIT who is in both archeology and materials science at MIT reproduced it.[1] Copper, silver, and about 15% gold. Unfortunately, the document with the actual process is paywalled. Part of a long, long history of making stuff that looks goldish. [1] https://www.journals.uchicago.edu/doi/10.2307/505923 https://www.journals.uchicago.edu/doi/10.2307/505923