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<p>[QUOTE=&quot;RickieB, post: 44797, member: 2486&quot;]Hey Spider...</p><p><br /></p><p>each coin is made from a different metal composition..ie copper (pennies) for anything before 1965, copper plated zinc for 1982 and present&nbsp; pennies, nickle, clad coinage, silver, gold, platinum, and pallidium..gold is corrosion resistant, silver will tarnish, pit and degrade if exposed to the right chemicals, nickle will pit, corrode if subjected to acidic materials, copper and clad are in the semi same arena..we all know the greenish &quot;patina&quot; copper gets also known as &quot;Verde&quot; (green in Spanish)...(water and it&#039;s ionic properties) are/is catalyst for the onset of corrosion as well as electrical current direct or indirect, humidity (water vapor) exposure to air, light, and any other material that can potentially leach onto a coin can have dramatic effects. Gold is immume to most things..so if you want to protect your coins from the transfer potential by contact...store them in different containers..you can reference any chemistry book for this information..Hope that helps you.. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie6" alt=":cool:" unselectable="on" unselectable="on" />&nbsp; Thats why you hear store this in a cool dry and dark place..[/QUOTE]</p><p><br /></p>

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