The pens here does fade over time (the marker that is yellow when the bill is real and black when counterfeit). My sister works at a bank, she found a 20$ bill with the green seal missing on the front and it is in reverse on back. She used the marker on it. I told her she shouldn't of done that. I got the bill from her and the mark she put on the bill faded away.
Rich
Edited by Coins1371
10/30/2010 07:44 am