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aqua regia noun

  /ˈɑː.kwə ˈɹeɪ.ɡi.ə/ , /ˌækwə ˈɹiː.ʒə/
  • (inorganic compound, archaic) A mixture of three parts concentrated hydrochloric acid to one part concentrated nitric acid, named for its ability to dissolve gold.
 agua regia
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