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Plaster making crystals


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So I have a plaster mold that has been used about 12 times,bit leakie but it works with extra precautions.  After my last pour and opening I had these funky crystals show up on one side.  I have been slow drying it between pours by a heater so dont know if this is the cause.  Just wondering if this is normal for a large slip cast mold.  Have to say it's rather pretty...

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Edited by Dianesart
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