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| Keywords: De Re Metallica 1556 p 363 AQ22 (2).TIF De re metallica libri XII quibus officia instrumenta machinae ac omnia denique ad metallicam spectantia non modo luculentissimè describuntur sed et per effigies suis locis insertas adjunctis Latinis Germanicisq́ue appellationibus ita ob oculos ponuntur ut clariùs tradi non possint ; ejusdem De animantibus subterraneis liber ab autore recognitus ; cum indicibus diversis / Georgii Agricolae Kempnicensis medici ac philosophi clarissimi by Georgii Agricolae Basileae Helvet Sumptibus itemq́ue typis chalcographicis Ludovici Regis anno 1621 Separation of gold and silver by sulfur Since acid was expensive to produce for low-grade alloy Agricola outlined a method in which the alloy is granulated combined with sulfur and heated at a low temperature Much of the silver reacts to form silver sulfide leaving behind a more concentrated alloy which can then be separated using the acid process http //othmerlib chemheritage org/record b1040553~S6 Catalog Information From the copy in the Roy G Neville Historical Chemical Library http //www chemheritage org/ Chemical Heritage Foundation Downloaded with permission from the Chemical Heritage Foundation as part of the Wikipedian in Residence Initiative Chemical Heritage Foundation http //www chemheritage org/ Chemical Heritage Foundation 1556 PD-old-100-1923 PD-1923 cc-by-3 0 Chemical Heritage Foundation Images from the Chemical Heritage Foundation De re metallica | ||||