[Jewelry making - Article 00024] - Re: [Orchid] Utility Sink, Hard or Soft Water?

[LEESSILVER]

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    Glenn, One caution.  Do not dump mixed investment in the sink. 
    Investment will even harden under water. I have used both tap water
    and softened water and never have been able to tell the difference. 
    I now use water obtained form a water mart store.  It contains less
    impurities. Helpful hints: I pour the investment int the flask through
    a kitchen strainer.  The strainer always stops small unmixed clumps
    of investment from getting into the flask.  I mix the investment
    with an electric mixer for about 1.5 minutes. I vacuum cast.  I use
    the curved surface of a trowel to form a slightly concave surface in
    the end opposite the sprue.  I believe the concave surface allows
    the vacuum to be distributed equally over the entire bottom of the
    flask. If you vacuum cast leave about 1/4 inch of head space for
    every inch of flask diameter.  If you loose the vacuum check the
    bottom of the flask to insure the mold did not fracture. Good Luck 

Lee

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