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<p>[QUOTE=&quot;Tom B, post: 1753390, member: 11854&quot;]I would imagine that most of the vibrantly toned coins from 150+ years ago have either been previously dipped or otherwise cleaned <i>or </i> they were stored in what we might call fortuitous conditions that allowed a combination of rather stable temperature, low relative humidity and little air flow.&nbsp; Regardless, there are astonishingly few US coins from 150+ years ago that are vibrantly toned.</p><p>&nbsp;</p><p>The coins we have today stand a much better chance at long term preservation in or near their current state since toning is affected greatly by the <i>continued exposure </i> of the coinage metal to conditions conducive to toning.&nbsp; The advent of climate control, both temperature and relative humidity, as well as fairly inert plastics or other holders will allow for coins present today to stay close to their appearance for perhaps many hundreds of years.[/QUOTE]</p><p><br /></p>

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