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<p>[QUOTE=&quot;krispy, post: 635930, member: 19065&quot;]This coin is not worth cleaning unless you want to use it as a test coin as others pointed out. There are LOADS of threads on CT that discuss coin cleaning issues that you inquired about, just search them and start reading the opinons and techniques. With that stated the green on the coin is typical Verdigris, look it up on Wikipedia. Avoid using lemon juice as it is acidic (natural acetic acid) and will only further erode what copper is left in this thing and likely change the copper&#039;s color. Definitely this coin has seen better days, had a long adventurous life and can be a learning tool for you to test out cleaning without harming a coin of any potential numismatic value.[/QUOTE]</p><p><br /></p>

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