I have noticed no "rubbing off" of anything from the keys afterwards. Oiling them seems to be enough. As long as they aren't rusty or anything, there isn't a problem.
leslie, you can buy antique keys in antique stores. Sometimes people have whole boxes of them and you can pick some out. You can also buy them on Ebay.
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"I am an artist… I am here to live out loud." Emile Zola
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