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provenance of gold hardness
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provenance of gold hardness

Sep 15, 2011 (1) Hard gold usually refer to alloy gold plating like gold cobalt or gold nickel which hardness is higher than soft gold (pure gold). (2) Besides hardness increase, the metal (like nickel or cobalt) co-deposit in alloy gold usually serves as a brightener as well to increase alloy gold deposit brightness to certain extent.

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