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<p>[QUOTE=&quot;900fine, post: 374155, member: 6036&quot;]Hey guys,</p><p>&nbsp;</p><p>We&#039;ve had a number of posts regarding proper coin storage and protection. It&#039;s widely known that high humidity is bad for long term storage.</p><p>&nbsp;</p><p>Well... <b>how dry is dry enough ?</b> I measured % relative humidity and saw values between 41%rh and 48%rh. Thanks to the cigar smoking fad, there are plenty of reasonably priced hygrometers available, including ones which will store min and max values.</p><p>&nbsp;</p><p>Also... does the max tolerable %rh vary depending on what metal is involved (Cu / Ni / Ag / Au / Pt) ? I suspect high grade silver proofs might be more sensitive than other coins.[/QUOTE]</p><p><br /></p>

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