I have been trying to find ways to make copper shine again after taking it from the landfill or after burning tough insulation off the wires. Right now im just on the salt and vinegar trick, but that makes it a grayish pink and really pale color. I also sand off the black resedue from the burned wires, but it still make that very pale unattractive color. Anyone know how to make it shiny again so i can sell it as bare bright?