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<p>[QUOTE=&quot;wxcoin, post: 4980500, member: 74624&quot;]I guess one could easily argue that no current method is perfect; it depends on ones definition of contamination.&nbsp; None of the slabbed coins are vacuum sealed in a gasless environment.&nbsp; I doubt if there&#039;s any plastic that doesn&#039;t leach out some sort of chemical; the rate varies among all types.&nbsp; Preservation methods today are superior to those a century ago but even with that said, many well preserved century old coins exist; usually with some sort of toning.&nbsp; I for one want to do my best to preserve coins in my collection but also have to weigh the costs in doing so and for how long.[/QUOTE]</p><p><br /></p>

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