[Jewelry making - Article 00748] - Re: [Orchid] Casting reheating investment molds

[Pat Hicks]

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    Hello Rick.  You have probably already had to take action and I'm
    late getting to this.  For the future and  for anyone else who has a
    burn-out problem or casting delay, take heart. 

    Of first importance, be sure your burn-out was gradual and not too
    hot at peak.  Second, let the flasks cool down naturally and  slowly,
    by just turning off the kiln and cracking the door a bit.  When they
    can be touched, you can take them out and wrap them in a zip-baggie
    with a wet paper towel.  This will stabilize the drying out process.
    When you know you can cast them, hopefully within a few days, but up
    to a week has been done successfully, set your kiln to the desired
    casting temp.  Take your flasks and gently dunk in  a pan of water
    briefly.  Gently is important in every step of handling burnt-out
    flasks - no impact of any kind please.  Place them in the kiln and
    cast as soon as you know they have come to the correct temperature. 
    You should have no serious problem with this, assuming all your
    investment mixtures and the first burn-out were ideal.  The casting
    gods seem to look with favor on our emergencies. This has been
    necessary any number of times due to power-failures, human failures,
    etc. with the casting at the school where I teach.  Try to stay calm
    and do everything right in spite of the delay.  Your castings will
    probably turn out just fine.   All of ours were.  Let me know how it
    goes, or inquire further if necessary.   Good luck. 

Pat

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