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<p>[QUOTE=&quot;silentnviolent, post: 1816358, member: 8797&quot;]Improper mint wash: some moisture (water with or without added chemicals) gets trapped on the coin and then is prevented from evaporation or otherwise escaping the surface, causing it to bond with and/or etch onto the surface.</p><p><br /></p><p>This is not dissimilar to the development of a fungal infection: if the skin isn&#039;t cleaned off properly before applying a protectant such as desitin or other salves, the ointment itself locks the contaminant in and prevents it from simply rubbing off due to contact with clothes or a diaper. How&#039;s that for a metaphorical homology? <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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