[Jewelry making - Article 00507] - Re: [Orchid] Tuffa and cuttle fish casting

[will]

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    Hello All, this is a follow up on the difference between tuff and
    tufa. I found a reference, (Lyell, 1853), that describes tuff as a
    volcanic ash, but gives TWO varieties for tufa--  a calcareous tufa
    and a volcanic tufa. Volcanic tufa is an Italian name for tuff and is
    the variety used for tufa casting jewelry.  Calcareous tufa is not
    suitable for our purposes. Hope this helps. Will E.Dr. E. Hanuman 
Aspler
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