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How to Refine Gold by the Acid Method. The two acids which are used in this process are concentrated hydrochloric and nitric acids. These acids are very corrosive.
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Instructions for Large Scale Gold Refining By the Aqua Regia Acid Method
· How to Refine Gold With Nitric Acid. As valuable as pure gold is, gold is rarely pure. How to Dissolve Gold. Aqua Regia, quite simply,
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Anyone know how to get black gold clean? I've got some that seems to be stained with some sort of black oxidation. When you scrape it, it is yeller underneath.