I recently made this knife out of a copper tube. It's work hardened and keeps a pretty nice edge on it, works well as a throwing knife. To get the shine to stay on it, I polished it with coarse sandpaper, then fine, then used 2 different rubbing compounds to get the scratches off, then did 3 coats o...By: _Scratch_
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Source: http://www.instructables.com/id/Home-made-copper-knife/
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