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<p>[QUOTE=&quot;desertgem, post: 833361, member: 15199&quot;]For my purpose, <b>adverse cleaning</b> is an action that alters the surface of the coin in a way that damages the natural patina ( and there is a patina formed shortly after minting), and is not acceptable to most. <b>Cleaning</b> is an action where no alteration that damages the natural patina ( bright or toned) occurs, and is acceptable by most standards. <b> Conservation</b> is an action that may alter the surfaces of the coin in order to stop a destructive action or preserve specific aspects of the details. It is a necessary intervention and depending on what is done, may be acceptable to standards ( such as TPG) or it may not be ( No Grade , Genuine). Your definitions may differ.</p><p><br /></p><p>For people who do not know how to do the last 2 effectively, it is best to advise them not to do anything to their coins. If they can do the last 2, then they will anyway, no matter what people say. But if someone that I don&#039;t know their expertise, asks how to clean a coin, the answer will be on the cautious side.</p><p><br /></p><p>Anyone can adversely clean a coin, but they usually will have already done so before asking for advice.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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