How does aqua regia react with platinum and gold?

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rhodium — platinum group Rhodium foil and wire.

Aqua regia is a highly corrosive, red or yellowish liquid mixture consisting of one part concentrated nitric acid and three parts concentrated hydrochloric acid by volume.123

While gold and platinum are noble metals known for their outstanding resistance to oxidation and corrosion, they are not entirely inert. Aqua regia is effective at dissolving these metals because it generates highly oxidizing species. The nitric acid acts as a strong oxidizing agent, while the hydrochloric acid provides chloride ions that help dissolve the metals by forming soluble complexes.423

This property makes aqua regia a vital tool in analytical chemistry and industrial refining, where it is used to dissolve gold, platinum, and palladium for separation and purification processes.125