[Jewelry making - Article 00165] - Re: [Orchid] Flask temperature

[Tony Konrath]

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    Cuttlefish bone is a light structure and absorbs little heat from
    the metal. Casting investment, however, is denser and will take a
    great deal of the heat from the molten material causing it to freeze
    in the sprues. 

    You can cast with a small cold flask using steam - a highly exciting
    and rather dangerous procedure that gives variable results - but not
    with the large industry sized flasks. 

Tony Konrath
www.goldandstone.com


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