This information I got from an experience gold refining expert. Before refining scrap gold first you need to get the gold that you want to refine.
It could be old gold jewelry, or anything that is made of gold that is no longer wanted.
Once you get the gold it will be tossed into a hot acid bath of something called Aqua Regia.
Aqua Regia is a mix of Nitric acid and Hydrochloric acid, usually in a volumetric ratio of one to three.
Next you would add the gold carefully as to not splash the acid, remember to always wear gloves and protective clothing, as you would not want to hurt yourself in the process. The Aqua Regia is left to sit overnight and the next day.
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