[Jewelry making - Article 00471] - Re: [Orchid] Delft Clay Goes Crumbly etc.

[Peter W . Rowe]

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>     I received my Delft casting video about one week ago.  It quite
>     specifically demonstrates the Delft mold/sand being quenched after
>     each and every pour 

    Trust us.  You don't need to quench, and it just makes more of a
    mess.  The casting can be just left there for a couple minutes. 
    It'll take you that long to turn off the torch regulators and put away
    the crucible, etc.  Then seperate the mold halves carefully avoiding
    touching the cast metal with your fingers. Push the casting out of
    the upper mold half with tweezers or something, seperating the large
    bulk of the sand.  NOW quench the casting if you desire. But the sand
    should stay dry for longest life.  discard any sand that's
    discolored, and however much of the talc covered bits as you can
    (though that's not as important). 

Peter 


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