Boundary: Bleed area may not be visible.
by George Bernard/science Photo Library
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Separating Gold iPhone case by George Bernard/science Photo Library. Protect your iPhone with an impact-resistant, slim-profile, hard-shell case. The image is printed directly onto the case and wrapped around the edges for a beautiful presentation. Simply snap the case onto your iPhone for instant protection and direct access to all of the phone's features!
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Separating gold from its ores, engraving. The workers are using quicksilver (mercury), which has a chemical affinity for gold. When mercury is added... more
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Protect your with an impact-resistant, slim-profile, hard-shell case. The image is printed directly onto the case and wrapped around the edges for a beautiful presentation. Simply snap the case onto your for instant protection and direct access to all of the phone's features!
Separating gold from its ores, engraving. The workers are using quicksilver (mercury), which has a chemical affinity for gold. When mercury is added to finely crushed ore it dissolves the gold and forms amalgam, a process called amalgamation. Un-reacted mercury is removed from the amalgam by straining it through leather (7). The amalgam is then heated in an athanor furnace (1). Mercury has a lower melting temperature than gold, allowing its vapour to be collected in a receiver (3) and leaving pure gold (12). Taken from The Laws of Art and Nature, in Knowing, Judging, Assaying, Fining, Refining and Inlarging the Bodies of Confin'd Metals (1683) John Pettus, a translation of the work by Lazarus Erckern.
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$41.95
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