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<p>[QUOTE=&quot;borgovan, post: 510280, member: 13016&quot;]I wouldn&#039;t be too worried about the polycarbonate. The SAN may give off vapors when warmed, I&#039;m thinking, that could tone your coins. </p><p>&nbsp;</p><p>If I had coins I wanted to keep from toning (which I do), I would place them in standard plastic tubes (either the original 20-coin green-top silver eagle tubes, or else good aftermarket tubes) and then wrap these in aluminum foil. The aluminum will not only help prevent air from reaching the tube, but it is also pretty reactive, and any contaminants will react with the aluminum before they have a chance to reach your tube. </p><p>&nbsp;</p><p>If you wanna go ultra-ridiculous, you could then take your foil-wrapped tubes and place them in your air-tight, vacuum-sealed bags. That should keep your coins untoned for a couple of thousand years.[/QUOTE]</p><p><br /></p>

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