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| Keywords: De Re Metallica 1556 p 360 AQ21 (1).TIF De re metallica libri XII quibus officia instrumenta machinae ac omnia denique ad Metallicam spectantia non modò luculentissimè describuntur sed et per effigies suis locis insertas adiunctis Latinis Germanicisque appellationibus ita ob oculos ponuntur ut clarius tradi non possint Eiusdem De animantibus subterraneis liber ab autore recognitus cum indicibus diuersis quicquid in opere tractatum est pulchrè demonstrantibus atque omnibus nunc iterum ad archetypum diligenter restitutis et castigatis by Georgii Agricolae Basileae Froben 1561 Separation of gold and silver by nitric acid A gold-silver alloy is combined with nitric acid and heated in an ampule A which dissolves the silver leaving the gold behind The silver is recovered from the solvent either by precipitating it in a copper bowl or by drying the solution in a distillation apparatus http //othmerlib chemheritage org/record b1033128~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 | ||||