This should be caused by improper drying of the notes, at least for paper. I've seen a few on ebay advertised as so, but I think for polymer notes, a good rub of that area could also have the same effect.
It looks like on your note, the smear areas also seem to be near a fold. I'd just get another early $100 and rub it against something to see if the effect can be recreated.
It looks like on your note, the smear areas also seem to be near a fold. I'd just get another early $100 and rub it against something to see if the effect can be recreated.
























