[Jewelry making - Article 00752] - Re: [Orchid] Platinum enhanced sterling?

[nick]

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    The Egyptians and ancient Greeks both used electrum, the Greeks did
    have some as coinage. As an alloy it does occur in nature in the same
    way as gold occurs as alluvial nuggets. The term is a general one
    rather than a specific crystallography. There are no written (as far
    as I know) references to the Greeks refining gold my lithage but they
    must have done so otherwise the eureka moment would have never
    occurred. Strangely, one of my students asked me about preparing a
    Pt/Cu alloy for making a nanoporous filter and when I had shown her
    the processes involved that culminated in dissolving the copper away
    to leave a perforated Pt film she was amazed to discover that she
    wasnt the first to do this when I showed her a paper on Roman coin
    making. we now have a student doing a PhD in colouring glass, as if
    no-one has ever tried that! 

Nick
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