If it does turn out to be all copper, dont waste your time polishing it for bare bright. The specs for the mills that buy bare bright is for bright and shiny wire only. Just clean it up enough to get #1 for it. YOu should still have it shot though because copper is a soft metal and it is usally alloyed with something for apllications other than pipes and wire. Also if there is any threading in the holes, it will be #2 copper. Threads on copper will always make it #2, unless you sell it some place where they dont know that
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