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<p>[QUOTE=&quot;GDJMSP, post: 766679, member: 112&quot;]Yes, it happens every day. And just about anyone who has owned a slabbed coin for more than few years has had it happen to them, even if they aren&#039;t aware of it.</p><p><br /></p><p>And by the way, even though that Gem BU coin you ask about becomes toned in the slab - it is still Gem BU - after it becomes toned.</p><p><br /></p><p>As for the coin you pictured in your original post, it looks to me like there was condensation inside the slab. This happens all the time, often because the owner of the coin leaves it his/her car overnight. At night the car cools down and the contents inside become cold. Then as the sun rises the contents become hot and condensation forms inside the slab. Now there are many other ways this can happen, but the result is the same.</p><p><br /></p><p>No coin holder made is airtight - none. And coins can tone inside any of them. The best you can do is to slow down the toning process with proper storage. And in simplest terms that means storing your coins in a cool, dark place where the temperature does not vary more than few degrees and the humidity is kept to a minimum.[/QUOTE]</p><p><br /></p>

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