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<p>[QUOTE=&quot;Tom B, post: 1835060, member: 11854&quot;]I won&#039;t really touch the toning vs. tarnish vs. corrosion debate since it appears to be to be rather firmly embedded into the psyche of the individual using the terms and can illuminate a bit about the agenda or philosophy of the person who uses the term.&nbsp; Therefore, call it what you like if it makes you feel warm and fuzzy.</p><p><br /></p><p>The NGC and PCGS holders <i>are not </i> airtight and they do not claim they are airtight, either.&nbsp; Toning occurs when the coin is subjected to an environment conducive to toning and can occur relatively quickly or essentially not at all.&nbsp; Folks who write that all toned coins might progress to black may be correct in a theoretical sense that in 1,000 or 10,000 years the coins will be black, but I do not care about that timeline.&nbsp; This is similar to fretting that your home will be rubble in five centuries; no one frets over that possibility.[/QUOTE]</p><p><br /></p>

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