How do I clean copper jello molds?

by Donna

I love the look of copper and had some of my mothers old jello molds. I plan to hang them in the kitchen as wall art (not use them for food). A friend knew of my plan and picked some up at a yard sale for me, unfortunately, they are black inside and along the edges. How do I clean copper? I looked online and found the suggestion of a paste of salt and vinegar - it didn't work very well. I'm also considering just spray painting them a shiny copper finish but I'd like to restore them if possible.

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