[Jewelry making - Article 01646] - [Orchid] Yellow stain on sterling castings

[Douglas]

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Hi everyone,

    I have been vacuum casting sterling with a torch using the
    anti-firescale method, and while I no longer have any red or purple
    firescale, There is a cloudy yellowish layer on the surface of my
    castings. Like firescale it only shows in the proper light or at the
    right angle, but it's not as deep as typical firescale, it comes off
    with rouge, but it takes a really long time and it's quite difficult
    to remove from recessed areas. Could it be a reaction with the wax
    fumes from the type of wax I use for the post casting anti firescale
    procedure? I usually use bits of broken wax web since that's what I
    have laying around. Thanks for your ideas. 

Douglas
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