[Jewelry making - Article 00112] - Re: [Orchid] Cement-like gunk on castings

[Peter W . Rowe]

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    Well, to start with, I wonder if your apparent suspicion that the
    torch is the culprit may be too quick, since for my part, I cannot
    think of any way in which the torch might do such a thing. So
    perhaps you can start by telling us quite a bit more about what
    you're doing. At the moment, all we know is you're using an
    oxy/propane torch, and doing lost wax casting. Tell us, for starters,
    what metal alloys you're casting. Continue with what type of
    investment you use, what sort of burnout oven you use, describe in
    detail your investing and burnout and casting procedure. And then,
    perhaps you'd be able to describe the deposit a bit better.
    "Cement-like" is somewhat vague. What color is it? What have you used
    in trying to remove it? Is it a foreign material, or is it a rough
    surface to the metal itself? Etc. Etc.... 

Peter Rowe
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