[Jewelry making - Article 00096] - Re: [Orchid] Cloisonne Enameling on Cast Silver

[pwrowe1]

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    Al, your wrong about the copper.  The sterling standard says 92.5
    percent silver.  It does NOT specify what the remaining 7.5 should
    be.  Yes, if you take sterling with 7.5 percent copper, and add
    other things too it, the silver percentage then changes and it's not
    sterling.  But if you REPLACE some or all of the copper with other
    metals, so the silver percentage remains 92.5, then it can still be
    called sterling.  This is the what Jack Ogden was explaining.  If
    you contact various metals suppliers for sterling casting grain,
    you'll find there are now a number of varieties available.  Some
    have no copper at all, I suspect.  The no fire scale sterling
    casting alloys don't do it with just trace deoxidizers or anything. 
    They do it by using other metals in place of the copper.  Tin, for
    example...   These, despite having metals other than copper as the
    alloy, can still be called sterling.  And to use YOUR example, if
    you mix 100 grams of lead with 100 grams of gold, you can't of
    course call it 24K.  But you CAN call it 12K, even though it's not
    an alloy anyone would normally use for jewelery. 

Peter Rowe

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