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<p>[QUOTE="SuperDave, post: 2374745, member: 1892"]Your first and deadliest enemy regarding coin storage is <b>oxygen</b>. Humidity is bad, but virtually all adverse coin reactions are functions of oxidation, or reactions in which oxygen plays an important role. Your second enemy is keeping the coins in contact with something containing chemicals capable of reacting with them in the presence of that oxygen. In this case, it seems both conditions have been met, and you're now paying the price.</p><p><br /></p><p>Green is a panic-level color when it comes to coins. It's usually present when the worst of possible reactions have occurred. The flaky appearance, and the fact that it's so visible on the cardboard as well as the coins, indicates that the cardboard itself was a deadly choice on the part of the manufacturer considering what they intended to be placed there. I can't say I'm positive yet what precise chemical process ended up like this - I've rarely seen such involvement of the actual container in similar cases and the flakiness spreading onto the cardboard throws me a bit - but the solution is clear and my recommendation never varies.</p><p><br /></p><p><i>Keep your coins and bills individually packaged in archive-quality containers, and prevent oxygen from reaching them</i>. I'm a big fan of vacuum packing. Silica dessicants are an excellent idea as well, although the same processes which keep oxygen from your valuables also tends to keep humidity out.[/QUOTE]</p><p><br /></p>
[QUOTE="SuperDave, post: 2374745, member: 1892"]Your first and deadliest enemy regarding coin storage is [B]oxygen[/B]. Humidity is bad, but virtually all adverse coin reactions are functions of oxidation, or reactions in which oxygen plays an important role. Your second enemy is keeping the coins in contact with something containing chemicals capable of reacting with them in the presence of that oxygen. In this case, it seems both conditions have been met, and you're now paying the price. Green is a panic-level color when it comes to coins. It's usually present when the worst of possible reactions have occurred. The flaky appearance, and the fact that it's so visible on the cardboard as well as the coins, indicates that the cardboard itself was a deadly choice on the part of the manufacturer considering what they intended to be placed there. I can't say I'm positive yet what precise chemical process ended up like this - I've rarely seen such involvement of the actual container in similar cases and the flakiness spreading onto the cardboard throws me a bit - but the solution is clear and my recommendation never varies. [I]Keep your coins and bills individually packaged in archive-quality containers, and prevent oxygen from reaching them[/I]. I'm a big fan of vacuum packing. Silica dessicants are an excellent idea as well, although the same processes which keep oxygen from your valuables also tends to keep humidity out.[/QUOTE]
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