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<p>[QUOTE=&quot;MrSpud, post: 96720, member: 4621&quot;]Another reason why it can be bad to clean a coin is that you disrupt the surface layer of the coin exposing more reactive metal to the elements and increase the likelihood of future corrosion.</p><p><br /></p><p>When a fresh coin is made its surface is very reactive and the metal seeks to combine with chemicals in the atmosphere in order to become more stable and less reactive. A layer forms on the surface of the coin that is less reactive than the fresh coin. When you clean a coin you disrupt this layer and make the coins surface more reactive until a new layer forms. Depending on what the coin is exposed to the coin can corrode or discolor easier.</p><p><br /></p><p>An exception to this general rule is if there is aggressive corrosion taking place on the surface of the coin. For example, if the coin was exposed to PVC and the PVCs plasticizer reacts with the coin and makes that green looking stuff which is actually a form of hydrochloric acid which can eat into the coin if not removed. Then careful removal with an appropriate solvent can actually be a benefit the coin.[/QUOTE]</p><p><br /></p>

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