24-karat gold is not completely pure, because there is a small amount of copper in it. You can mould a piece of absolutely pure gold using your hands only. This explains the fact that it is possible to produce a golden sheet that covers almost 2 sq meters (21.5 sq feet) out of less than 1 g (0.03 oz) of gold. But who needs to do this? Scientists have estimated that the amount of gold in all oceans is about 10 thousand million tonnes.
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