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But Aureliano spent the money on muriatic add to prepare some aqua regia and he beautified the keys by plating them with gold.

As German troops marched in the streets of Copenhagen, chemist George de Hevesy stashed the medals in aqua regia, an acid strong enough to dissolve gold.

It will appear later, from the method of manufacture, that hydrochloric, nitric, and sulphuric acids and aqua regia were more or less all produced and all included in this term.

Auric chloride, or gold trichloride, AuCl3, is a dark ruby-red or reddish-brown, crystalline, deliquescent powder obtained by dissolving the metal in aqua regia.

Cobalt, dissolved in aqua regia, makes an excellent sympathetic ink, appearing green when held to the fire, and disappearing when cold, unless it has been heated too much, when it burns the paper.