[Jewelry making - Article 00871] - [Orchid] Vacuuming investment

[Robert Hood]

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    My casting reference warns about boiling the investment, however, I
    ignore this warning and boil my investment every time I prepare for
    casting.  I let off the vacuum for a short time each time the
    investment boils . When I am within  a minute of the working time for
    the investment  I let the vacuum off and continue tapping the
    investment table to free any remaining bubbles.  Of course, if you
    boil the investment beyond its working period, you're going to have
    troubles. R.H. 


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