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<p>[QUOTE=&quot;desertgem, post: 692522, member: 15199&quot;]It is quite possible that the culprit is the shoebox. They are usually made of coarse cardboard and probably sulfur. I would switch to a polystyrene or polyethylene box such as found at Big Lots or similar. generally if they are approved for food storage, they are safe for coins as no PVC plasticizers.</p><p><br /></p><p>You can lessen toning by making a &quot;sacrificial coins&quot; container. Find a non-vinyl plastic container that can hold copper cents. I have used plastic prescription bottles ( I like the Target pharmacy flattened ones, drilled holes in them ( 1/8&quot; ) and then took some modern cents out of change, and cleaned with detergent and a scrubber pad until they are bright and &quot;raw&quot; looking. Dry them, and put into the container. They are ruined, but because the copper is fresh, it will react with environmental gases more rapidly than the copper and silver in your other normal coins, saving them and sacrificing themselves. You can tell how much toning gas is in your enclosure by how fast the sacrificials turn ugly. Remove them and replace with new and repeat. I have drilled mylar 2x2 flips and put the sacrificials into them and put into the coin storage boxes ( both card board and hard plastic). </p><p><br /></p><p>You still need your dessicants to control the mositure.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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