[Jewelry making - Article 00271] - Re: [Orchid] Tuffa and cuttle fish casting

[Katherine Palochak]

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    Tufa doesn't have the accentuated texture of cuttlebone, instead
    being slightly pebbled. It carves as easily as cuttle, perhaps a
    little easier, and certainly doesn't smell as nasty when casting.
    Blocks of casting investment can be substituted for tufa, with a
    resulting finer texture (almost smooth). There is an online technical
    article from Lapidary Journal on tufa casting at
    http://www.lapidaryjournal.com/jj/jun00jj.cfm 

    I buy mine from IJS or Thunderbird out of Gallup, NM. You can also
    check with local quarries. If they don't have it, sometimes they can
    point you to another nearby source. Ditto for rockhound clubs--just
    specify tufa, not tuff. Tuff is too hard and grainy.

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