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Do Cooksongold stock Black Gold?

Cooksongold do not supply Black Gold.
However creating black gold is possible using a few different techniques. Electrodeposition using black rhodium or ruthenium is one method. Amorphouse carbon is also used at times, with the plasma assisted chemical vapour deposition process. 
Controlled oxidation of carat gold containing chromium or cobalt can also be made to yield black gold. 
Ruthenium containing, electroplating solutions give a slightly harder black coating as compared to electroplating solutions that contain rhodium.