WHATEVER YOU DO, DO NOT CLEAN THAT TARNISHED COIN

For many newcomers to the world of numismatics, tarnished coins may appear ugly, dirty, and worth a whole lot of nothing. As we have all learned over the course of our lifetime, appearances are not everything. Tarnished coins have created their own distinct niche, which collectors love to expand on. The reason for this

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A friend of mine claims that “it's alright to clean coins as long as you know what you're doing.” Obviously he doesn't : r/coins

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