Start with a toothbrush to see if any of it does come off, you may want to try sandpaper as well. Do both methods really slow and not hard. This method will not work on the paper portion, so just be careful – most likely it looks like it is already below improving. Never know until you try, a very small metal brush like you would use for copper or metal pipping may work as well, also may damage it more – just too bad you do not have a common to try it on.
These are always cool to see anyways – good luck!
Jimmy
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