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<p>[QUOTE=&quot;GDJMSP, post: 1714835, member: 112&quot;]If you leave them in the boxes, which is what you should not do, yes. If you take them out of the boxes, which is what you should do, yes.</p><p><br /></p><p>The boxes that coins come in from the mint are laden with sulphur and other chemicals, and those things can be harmful to your coins. So all coins should always be removed from from the paper and cardboard packing they come in from the mint. Then the packaging materials should be carefully put away and stored someplace away from the coins. The coins, in their hard plastic cases, should then be stored properly.</p><p><br /></p><p>Zip-Loc bags, or any other sealed container, will always offer an advantage to coin storage in that they provide an additional layer of protection from the air. And any time you can lessen the amount of air getting to your coins, that&#039;s a good thing. But Zip-Locs are not airtight, and no coin holder is airtight. But they both do help lessen the air flow getting to the coins.</p><p><br /></p><p>But of you were to put the packaging inside a Zip-Loc with the coins inside, then you have just trapped all of those chemicals that are released from the packaging over time in the form of gasses, with the coins. Thus increasing the coin&#039;s exposure to those chemicals.</p><p><br /></p><p>Proper coin storage has been discussed and explained many, many times. But the rules are simple are few. Always try to reduce the amount of air that can get to your coins. Never store anything made of paper, or cardboard with your coins. Always try to control (lessen) the humidity inside your coin storage container. Always try to keep the temperature as cool and as consistent as possible. Always store your coins in the dark. That&#039;s about it.[/QUOTE]</p><p><br /></p>

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