[Jewelry making - Article 00913] - Re: [Orchid] Stains on Rubber molds

[John A. Henkel]

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    Hi Bill and Merry Christmas to all, It is the sulfer in the rubber
    that is reacting to the copper in the bronze and brass. It will also
    react with sterling silver because of the small amount of copper in
    it. Don't throw away your stained molds just yet. Clean the surface
    with a Q-tip and some Citra-Solv. This will remove the surface "dirt"
    that is causing the problem with your waxes. When I want the best
    results I have the model rhodium plated along with the sprue and
    former. You should also try Castaldo's "Gelato" silcone mold rubbers,
    very colorful and no need for the spray. 

    John, J.A.Henkel Co., Inc., Moldmaking Casting Finishing, Producing
    Solutions For Jewelry Artists, Our long haired German Shepherd
    "Ruby" loves the sub zero weather here in Maine. 


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