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<p>[QUOTE=&quot;GDJMSP, post: 155312, member: 112&quot;]None of the TPG slabs are. But NGC does have a newer slab they say is airtight.</p><p><br /></p><p>salty - </p><p><br /></p><p>My guess is the toning is due to improper storage. If you change your storage method and contorl the humidity the toning will likely stop. But the other posters are correct - with toning value can go either way as beauty is in the eye of the beholder.But unless the toning actually turns to corrosion it will not alter the grade.[/QUOTE]</p><p><br /></p>

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