Has anybody thought about melting their copper wire into ingots for storage? I have entertained the idea (not seriously yet, but entertaining the notion), and just wondered if anyone else has thought about it. From what I can tell, the purity of copper wire is 99.99%. Supposedly it has to be that to efficiently conduct the electricity. If anyone has considered it, I wonder what would be a good way to melt it. I am assuming furnace. Also, anyone have any idea what the purity of copper tubing would be (since it does not need to conduct electricity)?