The Nordic gold reference article from the English Wikipedia on 24-Apr-2004
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Nordic gold

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Nordic gold is the alloy from which the middle three denominations of euro coins, 50 cent, 20 cent, and 10 cent coins are made. It has also been in use for a number of years in other countries.

It contains no gold, which is likely to lead to a number of misleading trade descriptions, its composition being:-

MetalPercentage
Copper (Cu)89%
Aluminium (Al)5%
Zinc (Zn)5%
Tin (Sn)1%