Interesting article on BBC's website today-it appears the Postage Stamp hobby has a detection system that detects skullduggery. To quote: "Image-analysis software, such as Retro Reveal, which can edit the image of a stamp in 50 different ways to expose anything fraudulent, is very widely used across the hobby,"
I would assume something similar, if not this actual program, could be used for cards and paper ephemera after reading this:
https://dssumd.wordpress.com/2013/05...-retro-reveal/
Apparently the pricier or more esoteric stuff can be farmed out to forensic experts familiar with the items they are looking at.
Retro Reveal is freeware, it would seem it would have some application to our hobby and help out with the rampant fraud presently occurring.
Here is the full BBC article:
https://www.bbc.com/news/business-49632306