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Gold Aqua regia dissolving refining recovery 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.
