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Big voids and holes after copper casting
Hello,
I made some lost wax castings in the flasks using pure copper. In all castings there were large voids and holes, it happened to me sometimes even with silver, but to a lesser extent, with copper instead the final result is completely unusable, I've never been able to figure out what caused it and how to fix it the problem. Does anyone know how I could fix it? Thanks a lot.
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