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WASHINGTON, Dec. 19, 2017 � Acids are reactive, with even weak acids like vinegar interacting with other materials to wow students. But strong acids can really put on a show. For example, aqua regia, or royal water, is a mixture of two strong acids -- hydrochloric and nitric acids � that can dissolve gold, a noble metal. This reaction can be put to use. Watch as Reactions employs some acid know-how to explain a chemistry detective story to sort real gold from its imposters: .

Reactions is a video series produced by the American Chemical Öйú365betÖÐÎĹÙÍø and PBS Digital Studios. Subscribe to Reactions at and follow us on Twitter .

The American Chemical Öйú365betÖÐÎĹÙÍø, the world’s largest scientific society, is a not-for-profit organization chartered by the U.S. Congress. ACS is a global leader in providing access to chemistry-related information and research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.