From Alloy to Purity: The Chemistry of Gold Extraction"

"This process outlines the extraction of pure gold from a mixture of silver and copper. Initially, nitric acid is employed to dissolve the non-gold metals, effectively isolating the gold. For complete separation, aqua regia—a powerful blend of nitric and hydrochloric acids—is used, which can dissolve the gold, creating a gold solution ready for further purification."

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