[Jewelry making - Article 00022] - Re: [Orchid] Platinum rings - which alloy is best?

[John Donivan]

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    The reply to this thread that I read suggested the like of 950
    Platinum, and another. It is largely a matter of opinion, and
    personal choice, of course. Casters love 950 because of it's flow
    and such. I've worked Platinum intensively for many years, and to me
    there is only one - 10% IrPlat. All of the rest, and believe me, I've
    used each and every one of them, are inferior alloys. If you are
    going to cast a wax, not size it or alter it, and simply polish it
    and put it out, then 950 is OK - it polishes easily and takes a great
    shine (except it's blue). If you want to do anything else, it's
    garbage. 10%Ir is like working in clay or fine wax - the others more
    resemble brass or something. Gas, porosity, surface problems, on and
    on. Not to rant - I guess there are other points of view - I just
    take the position that putting cobalt in platinum is a waste of good
    platinum.....

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