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					Originally Posted by Jobu  I think David Cycleback is at Northwestern University and is an expert - also a board member. You might shoot him a pm. 
As for looking at the printing, you are looking for halftone, see pg 80-84 of David's book:
https://cycleback.files.wordpress.co..._an_intr-1.pdf | 
	
 forensic evaluation is in order...David!