- Jun 5, 2023
I am ready to aqua regia 20 grams of gold. The gold is still a little dirty with traces of aluminum and any other metal that may be in foil tape. There may be some residue of adhesive but not sure about that. What should I do to assure a good run? I was thinking of adding some copper to the mix. What do you think? Also I’m not sure how much copper to add. Also can I use pennies for copper?