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How to Gold refining pure gold precipitates. If you're precipitating using sodium metabisulfite: Add 1 ounce (about 1-1/2 tablespoons) for every ounce of dissolved metal in solution. This should be done out-of-doors because the vapors from the bisulfite are corrosive. No matter how good your ventilation system is, it is unlikely to be good enough when using this compound. #puregold #Aquaregia #gold | Archimedes Channel

While soaking CPU pins in nitric acid is a crucial **preliminary step** to dissolve the non-gold metals, **nitric acid alone will not dissolve pure gold** or cause it to "fall off" as a usable product. The subsequent step—dissolving the gold itself—requires the use of the far more dangerous chemical combination, **Aqua Regia**, a process reserved for professional or highly experienced refiners. | Archimedes Channel