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<p>[QUOTE=&quot;Conder101, post: 4939063, member: 66&quot;]Stopping or nearly stopping the toning probably can be accomplished.&nbsp; The key is moisture.&nbsp; The reaction that causes the toning requires water to proceed and the water vapor in the air is enough to cause it.&nbsp; The self slab shell is a good start but it isn&#039;t air tight and the key is as dry an environment as possible.&nbsp; So you need to create a microenvironment&nbsp; Put the shell inside a ziplock bag with some freshly recharged silica gel and seal it up&nbsp; the silica gel will absorb almost all the moisture out of the air in the bag so any air that gets into the slab shell will be as dry as possible.&nbsp; </p><p><br /></p><p>The ziplock isn&#039;t completely air tight either so eventually the silica will be come saturated and need recharging.&nbsp; You can delay this with a defense in depth strategy.&nbsp; Put the slab and bag in a tupperware with more silica gel in the tupperware with the bag.&nbsp; Air and moisture will take a long time to get into the tupperware where the silica will absorb the moisture.&nbsp; Any air that then get into the bag will already be very dry, and the silica in the bag will then absorb that before it can get through the shell to the coin.&nbsp; </p><p><br /></p><p>This also has the advantage that when the gel in the box get saturated while you take it out and recharge it the bag and its gel will still be protecting the coin.[/QUOTE]</p><p><br /></p>

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