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Electroplating Metal Oxides...View Instructable »
If you preheat the mold, this shouldn't be an issue. I'm not an expert on the subject but I've read that they preheat the plaster molds almost to the temperature of the molten metal to prevent thermal shock but the mold is also broken to get the part out. They were casting iron with the lost wax method of making the molds.
Extracting Copper from Bras...View Instructable »
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