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HankronTip #5: Identifying Many Modern Fakes with a Black Light
Many on this board are already aware of how black light works to identify many modern reprints and fakes. But, for those unfamiliar with the process, read the below link. Using a black light is a scientifically sophisticated (it actually tests the atomic makeup of paper and inks), yet is inexepensive and easy. Black lights can be used to identify reprints of a wide variety of antique paper items, from cabinet cards to T206s.
http://www.cycleback.com/earlyphotos/seven.html