Opinions on Aqua regia

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Aqua regia (Latin, lit. "royal water"), aqua regis (Latin, lit. "king's water"), or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, optimally in a volume ratio of 1:3. It was named so because it can dissolve the noble metals gold and platinum. However, titanium, iridium, ruthenium, rhenium, tantalum, niobium, hafnium, osmium, rhodium and tungsten are capable of withstanding its corrosive properties.

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