[Jewelry making - Article 01177] - Re: [Orchid] Casting Silver medalions

[Lee Einer]

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    The glassy stuff is the borax. I doubt that it is causing the
    problems with the pour. 

    I do cuttlefish casting rather than sand casting, but the principle
    is the same, in that you are not pouring into a heated mold, but
    rather a room temperature mold, so your silver needs to be hot, hot,
    hot in order to completely fill the mold before it solidifies. I
    find that I need to heat the metal until the liquid blob appears to
    be spinning around, and continue heating until the flame around it
    becomes a bright yellow. I tilt the torch so that the flame heats
    the lip of the crucible as well as the silver, so the silver doesn't
    cool as I pour it. 

HTH,

Lee Einer
Dos Manos Jewelry
http://www.dosmanosjewelry.com

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