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It is possible but it can cause problems. Brass melts about 1000F but copper melts about 2000F. You must use a separate crucible for each metal or you will contaminate your metal. If you manage to spill any inside your forge it can contaminate any metal you heat in the forge later, especially if you are trying to weld damascus. If you plan to pour it into a mold you should probably heat the mold.
So, no reason you can't do it but it won't necessarily be easy with copper ...
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