I think it is a matter of degrees and everyone will have their "point" where doing something to a card crosses the line. A small erasure, an "ironed" crease, soaking to remove residue, rebuilding a corner, etc. I have a couple of "rules" that might be good guides as to whether the alteration is acceptable:
1.) Does it serve to conceal or disguise a flaw/defect?
2.) Would knowledge of the alteration be material to a reasonable collector (i.e. would the alteration affect how a typical collector would value the card)?
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