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

Ternary plot of the approximate colours of Ag–Au–Cu alloys used in jewellery making.

DHFCompany

DHF18KYellowStandard
DHF18KYellowDensity