"Aqua regia" Quotes from Famous Books
 ... substances. He that will examine his complex idea of gold, will find several of its ideas that make it up to be only powers; as the power of being melted, but of not spending itself in the fire; of being dissolved in AQUA REGIA, are ideas as necessary to make up our complex idea of gold, as its colour and weight: which, if duly considered, are also nothing but different powers. For, to speak truly, yellowness is not actually in gold, but is a power in gold to produce that idea in us by our eyes, when placed ...
— An Essay Concerning Humane Understanding, Volume I. - MDCXC, Based on the 2nd Edition, Books I. and II. (of 4) • John Locke |
