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<p>[QUOTE=&quot;GDJMSP, post: 3790, member: 112&quot;]Zinc naturally deteriorates in the atmosphere - it&#039;s the nature of the metal. As long as it is exposed to the air - that&#039;s what it will do. As for the use of WD-40 - can&#039;t say as I know for sure but it may remove the oxidation. But it will return in time. About the only way to stop it is to seal the coin and not allow any air to come in contact with the surface. </p><p><br /></p><p>This next part is anathema to me but it may present a solution to your problem. In the old days many collectors would seal their coins with shelac or clear fingernail polish in order to stop the effects of oxidation or toning. But with zinc - any of the whitish oxidation must first be removed. It does work. But any numimsmatic value the coin may have will be gone forever.</p><p><br /></p><p>Sorry I can&#039;t be of more help but that&#039;s about all I know.[/QUOTE]</p><p><br /></p>

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