Aloha Barry....as much as I respect your expertise on many old issues. You are mistaken about light pencil marks. They do destroy the paper fibers/sheen and graphite being primarily a grease (why it is used as a lubricant) will leave telltale signs, (maybe not to the naked eye) but definitely damages the paper..under certain lights and magnification the alteration can be detected. Granted the card was already defaced when originally marked but trying to erase may improve the visual aspect of the card it will definitely destroy it furthur. It is detectable with the right equipment which a "good TPG company" will have. Unfortunately I don't think there are any good TPG companys out there. My humble opinion about tpgs but fact about pencil marks. aloha, dave.
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