[Gavin Nugent]

Originally Posted by Nathaniel

Electrum = Naturally occurring silver & gold alloy

http://en.wikipedia.org/wiki/Electrum

List of Alloys
http://en.wikipedia.org/wiki/List_of_alloys

There are different hues of gold...

http://en.wikipedia.org/wiki/Colored_gold

Thanks Nathaniel,

Following your links further I came to this one;

http://en.wikipedia.org/wiki/Billon_(alloy)

It explains a mixture of both materials and its ancient roots.

Thanks

Gav