EP plaques are cast in 18K Yellow Standard gold alloy (75% gold, 25% mixture of silver and copper, no zinc) provided by the David H. Fell Company, Los Angeles, CA.
Click images to enarge.
![GoldColorsTernaryPlot](Pics/Gold/Ag-Au-Cu-colors.png)
Ternary plot of the approximate colours of Ag–Au–Cu alloys used in jewellery making.