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<p>[QUOTE=&quot;physics-fan3.14, post: 2492422, member: 19165&quot;]Yes, a couple of holders are well known for toning the coins they hold (exactly as you say - the plastic itself is gassing the coins, rather than some outside source). PCI holders are well known for this (sometimes it is quite attractive, sometimes it isn&#039;t). The old, small, white &quot;soap bar&quot; ANACS holders are also known for doing this.[/QUOTE]</p><p><br /></p>

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