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<p>[QUOTE=&quot;kanga, post: 367062, member: 9270&quot;]Zinc is a tough metal to preserve, particularly in a moist environment.</p><p>&nbsp;</p><p>1. If you already have &quot;crusty white&quot; surfaces, forget about the coins. It&#039;s like seeing the green goo from PVC. The damage is done.</p><p>&nbsp;</p><p>2. Except for expensive coins, purchase new undamaged coins and put them in something that will keep air and <u>moisture</u> away from them.</p><p><i>Airtites</i> and <i>Capital Plastics</i> holders come to mind.</p><p>&nbsp;</p><p>3. For expensive coins, get them into <i>Airtites</i> or <i>Capital Plastics</i> holders quickly.</p><p>&nbsp;</p><p>4. Store them in a place with a constant temperature and dry.</p><p>&nbsp;</p><p>5. Removing the white crust is cleaning them, and will significantly lower value.[/QUOTE]</p><p><br /></p>

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