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<p>[QUOTE="GDJMSP, post: 3130628, member: 112"]A fair comment. But the reality is they are not that resistant to permeability either. For example, buy the thick freezer type of Ziplocks. Put some Oreo cookies in one and seal it. Lay it down. The in the morning pick it back up, put the bag up to your nose, and without opening it - smell. You know what you'll smell ? Oreo cookies. And that occurs in just 8 hours or so. Now that would not be possible if the bags were not air permeable.</p><p><br /></p><p>Another example, take a slabbed coin, one that is blast white. Put it in a sealed container and pump the right gasses into that container. In just 3 or 4 hours that blast white coin will have beautiful toning on it. And if you think well it's the pressure that's doing it - well it isn't. Yes it's happening that quickly because of the pressure, but that's all. For if you take the same blast white slabbed coin and put it away for a few years, when you get it out and look at it it too will be toned. Maybe not the same, but it will have toned.</p><p><br /></p><p>Ya see, the same gasses that get pumped into that sealed container exist in the very air we breathe. But at much lower quantities and at no pressure to speak of. So it takes longer for the slabbed coin to tone when it's just left out in the air - but it does still tone.</p><p><br /></p><p>Everything I described in the post about proper storage will slow toning down as much as possible. And that's the best you can do. Well, almost anyway. As I have stated in other threads they do make glass jars that can be sealed airtight. And you can store your coins in them and bring toning to a complete standstill, for a time. But glass jars bring other hazards with them - they break, they crack, and they get opened from time to time. So there truly is no way known to man to ever completely stop coins from toning. At least not one that any collector is ever going to use.[/QUOTE]</p><p><br /></p>
[QUOTE="GDJMSP, post: 3130628, member: 112"]A fair comment. But the reality is they are not that resistant to permeability either. For example, buy the thick freezer type of Ziplocks. Put some Oreo cookies in one and seal it. Lay it down. The in the morning pick it back up, put the bag up to your nose, and without opening it - smell. You know what you'll smell ? Oreo cookies. And that occurs in just 8 hours or so. Now that would not be possible if the bags were not air permeable. Another example, take a slabbed coin, one that is blast white. Put it in a sealed container and pump the right gasses into that container. In just 3 or 4 hours that blast white coin will have beautiful toning on it. And if you think well it's the pressure that's doing it - well it isn't. Yes it's happening that quickly because of the pressure, but that's all. For if you take the same blast white slabbed coin and put it away for a few years, when you get it out and look at it it too will be toned. Maybe not the same, but it will have toned. Ya see, the same gasses that get pumped into that sealed container exist in the very air we breathe. But at much lower quantities and at no pressure to speak of. So it takes longer for the slabbed coin to tone when it's just left out in the air - but it does still tone. Everything I described in the post about proper storage will slow toning down as much as possible. And that's the best you can do. Well, almost anyway. As I have stated in other threads they do make glass jars that can be sealed airtight. And you can store your coins in them and bring toning to a complete standstill, for a time. But glass jars bring other hazards with them - they break, they crack, and they get opened from time to time. So there truly is no way known to man to ever completely stop coins from toning. At least not one that any collector is ever going to use.[/QUOTE]
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