Aqua Regia

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Aqua Regia translates from the Latin as "royal water." This is the combination of hydrochloric acid and nitric acids that will dissolve gold and platinum. These acids, mixed in different concentrations, can be used to determine the fineness of precious metals. This is accomplished by applying the acid over a streak of metal rubbed on a touchstone and observing the rate at which the metal streak dissolves.

Lang Antiques
Lang Antiques