aqua regia

mixture of nitric and hydrochloric acids capable of dissolving gold and platinum

Aqua regia (Latin for "royal water") is a highly corrosive, fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and concentrated hydrochloric acid, usually in a volumetric ratio of one to three respectively. It is one of the few reagents that dissolves gold and platinum. It was so named because it can dissolve the so-called royal, or noble metals, although tantalum, iridium, and a few other metals are able to withstand it.
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Noun
1. a yellow fuming corrosive mixture of nitric and hydrochloric acid that dissolves metals (including gold)
(synonym) nitrohydrochloric acid
(hypernym) acid

 Say it 
A mixture of nitric and hydrochloric acids, usually 1:3 or 1:4 parts HNO3 to HCl, used to dissolve gold.

aqua regia /'ækwə'ri:dʤjə/
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