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Message:: [QUOTE="Numbers, post: 980276, member: 11668"]The counterfeit-detecting pens should "work" on notes back to Series 1957, when the dry-intaglio printing process was introduced.  Before that, the notes were printed on dampened paper, and the sizing used in that process will cause the pens to declare them counterfeit. Incidentally, a modern note that's been through a laundry cycle with starch will also test as counterfeit, for the same reason.  And a counterfeit that's printed on good cotton bond paper may well test as genuine, since that paper won't contain the woodpulp starches that the pens are designed to detect.  In general, it's not a good idea to rely on those pens! As for the original poster's note--based on the images posted, I'd say it's more likely to be a genuine note that's had a rough life.  Ink transfer similar to this is fairly common on notes that have been folded and stored that way for a long time.  And while I'm not going to suggest that anybody ought to trust my opinion more than that of someone who actually had the note in hand, I'm also not going to suggest that the average bank teller really knows very much about counterfeit detection....  <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" />[/QUOTE]