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I know cleaning coins is considered taboo, but won't the blue oxidization on the pennies spread like cancer unless it's removed? I'm not sure how to approach the Morgan either. Thanks in

Estonian 50 Cent Vintage Random 19mm European Coin Copper Coin Collection Beautiful Collectible, Suitable for Gift for Coin Collectors : Office Products

Metal Polishing Cream | Metal Polish Cream | Metal Polishing Compound Paste Kit, Stainless Steel Cleaning Paste, Kitchen Pot Bottom Black Scale Rust

Metal Polishing Cream, Metal Polish Cream

Flitz Precious Metals Polishing Creme - Jewelry Cleaner for All Jewelr – WoodArtSupply