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<p>[QUOTE=&quot;robinjojo, post: 4682553, member: 110226&quot;]If the coin is silver, storing it in open air will result in toning over time, as the silver reacts to oxygen, starting with a very light brown-grey, and darkening from there.</p><p><br /></p><p>Now, some collectors store their silver coins in paper envelopes.&nbsp; The sulfur in the paper, especially manila paper, tends to create more for variegated toning, often quite colorful, with blues, yellow and brown.&nbsp; However, some collectors do not like this effect, especially on ancient coins, as the toning is not really &quot;ancient&quot; in appearance.&nbsp;&nbsp; </p><p><br /></p><p>I&#039;ve done both, but almost all of my ancients are stored in safety flips or open air.&nbsp; My modern coins are also in safety flips and some in manila envelopes.</p><p><br /></p><p>Whichever approach you take, depending the metal and the condition of the coin (lightly cleaned to over-cleaned &quot;shiny&quot;), the re-toning process will require time and patience.</p><p><br /></p><p>Bronze coins are another matter.&nbsp; Generally time will darken them if they have been cleaned, much the same way as pennies darken quite quickly.&nbsp; Also, ancient bronzes need to be examined closely for any problems, such as bronze disease, which requires immediate attention.</p><p><br /></p><p>Hope this helps.[/QUOTE]</p><p><br /></p>

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