Originally Posted by
ps_bond
It depends on the composition of your yellow... If it's something like Gold 91.67% Silver 5% Copper 2% Zinc 1.33% then it's 1.8334g Au, 0.1g Ag, 0.04g Cu, 0.0266g Zn.
(Broadly, you have 2g * 22/24 of gold, you want to reduce it as a proportion to 18/24 so the total weight of alloy becomes 2* (22/24)/(18/24) )
if you add enough copper to reduce it to 18ct (0.444g additional Cu) then you'll have 4% Ag, 19.8% Cu and 1% Zn - although most of the zinc will fume off anyway if it's in the alloy. Probably more of a pink gold than a rose and it's best to err on the side of caution and make sure your alloy is just over 18ct for hallmarking.
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