mercury in nitric acid leaves untouchedreal gold, and produces a white spot on thespurious. The thinnest layers of gold, whichit is frequently impossible to detect by meansof aqua regia, are immediately recognised bythis test. The coating of varnish must beremoved previous to its application.… … o know where tobegin is, nodoubt, a valuableacquisition to thedesigner, but wethink that, al-though, placedsecondary, toknow where toleave off shouldform one of hisearliest and mostdiligent studies.The object of or-nament is notmerely to forma maze throughwhich the eyewanders withoutbeing able to…
Design · Decoration and ornament · Art
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![An illustration from Sicilia et Magna Graecia, sive, Historiae vrbivm et popvlorvm Graeciae ex antiqvis nomismatibvs liber primus[-secundus] (1644)](https://img.insideoutlibrary.com/img/200/ia-siciliaetmagnagr01golt-377-98.webp)
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