(Nanowerk Spotlight) The Spaniards called it Tumbaga – an alloy of gold and copper which they found in widespread use by the pre-Columbian cultures in Central America. The popularity of this alloy ...
The combination of gold and copper is a good way to pull down the cost of gold and ameliorate the instability of copper. Through shape control, the synergy of these two metals can be better exploited.
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