Oh yes, this is most probably the correct thread to ask my question: I recently ran across a Finnish 5€ note that looked remarkably different in UV light. While all the other normal notes looked greenish, this one was really bright blue. It looks just like any other regular 5€ note when viewed in daylight, though. Initially I thought that maybe it has been accidentally washed or something, but the note would have been in a worse condition if it had been in a washing machine.
I suppose it was a printing error of some kind. I wonder if it has any value beyond the nominal 5€ or can I just put it back to circulation? I still have it stored at home, in case it turns out to be valuable.
