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<p>[QUOTE=&quot;GDJMSP, post: 14434018, member: 112&quot;]Food quality plastic bags like those and Ziplocks are fine, in and of themselves they contain no chemicals that will harm the coins. That said, the plastic they are made of is air permeable, in other words, air goes right through the face of the bag. And the same thing happens with the bags made of heavier and thicker plastic made for use in the freezer.</p><p><br /></p><p>It&#039;s quite easy for anyone to prove this to themselves. Take a Ziplock or your Food Saver bag and put something in it that has a distinctive smell, like a cut onion, or many different types of cookies. Seal the bag up and leave it overnight. The next day pick the bag up and smell it - you will smell whatever is inside that bag. And I&#039;m not talking about a &quot;hint&quot; of a smell, it will be readily and easily noticeable. And the reason you can smell it is because the plastic is air permeable.</p><p><br /></p><p>The only truly airtight containers that I know of that are readily available to consumers are the canning jars made for canning foods at home. They&#039;ve been around since long before I was born, they were around before my grandparents were born, and they&#039;re still around. The reason they&#039;re still around after over a century is because they work - they are truly airtight.</p><p><br /></p><p>But, it&#039;s not really necessary to use them to store coins. If one uses proper storage methods as I have described on this forum more times than I care to count, the toning on your coins will be slowed down to the point that it will be barely noticeable in your lifetime.[/QUOTE]</p><p><br /></p>

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