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The man had used the solution of aqua-regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid. Aqua regia was so named because it can dissolve the noble metals gold and platinum. After dipping the gold ornaments in it the outer layer of gold gets dissolved and the inner shiny layer appears.
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