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Do Slabs Protect?

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Pillar of the Community

United States
588 Posts
 Posted 01/31/2009  9:47 pm Show Profile   Bookmark this topic Add Podoprigora to your friends list Get a Link to this Message Number of Subscribers
If a coin is toned it's not a Perfect BU any more. So lets say for example there is a coin that is graded MS70. And it's stored for some time, will it ever get a toning. And if yes will it still be that exact grade? thank you
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SsuperDdave's Avatar
United States
23522 Posts
 Posted 02/01/2009  08:08 am  Show Profile   Bookmark this reply Add SsuperDdave to your friends list Get a Link to this Reply
Major TPG slabs are not air-tight, and will not stop the coin from toning if it is stored in an atmosphere conducive to toning. Toning will not affect grade (with the possible exception of 70's - I just don't know), and the TPG's offer a guarantee regarding the grade. If you resubmit a slabbed coin, and they lower the grade they initially assigned the coin, they will make you whole for the reduced value.

Of course, there's a lot of wiggle room in that statement, but instances of "making it good" have happened.
Bedrock of the Community
United States
20753 Posts
 Posted 02/03/2009  1:17 pm  Show Profile   Bookmark this reply Add just carl to your friends list Get a Link to this Reply
As to the grade it would depend on the amount of toning. Remember that toning is chemical reaction of the metal on a coin with an outside substance. If the toning continues sufficiently over time it becomes corrosion and possibly ruin the coin completely.
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