Posted By:
DaveTo repeat Leon, different grading companies have different rules of grading. PSA, for instance, will grade a card as clean when there is writing on it. The grade will be modified with MK, which means it is marked. Other companies will lower the grade, typically 2 points (on the PSA scale) for marking. It makes a big difference whether this is included in the grade or not.
Cards may be rejected for grading for many reasons other than reprint. With the exception of PRO (don't go there), grading companies will reject trimmed cards, or ones that have been bleached. This can be checked with a black light. Adding material to hide loss is not allowed.
Other flaws are mis-cut (MC) and off-center (OC) that may modify the grade, or just be noted as a grade qualifier. You'll see NQ sometimes on ebay - this means a "clean" grade, no qualifiers.