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Anonymousanother easy way to authenticate a&g cards is to view the card with oblique lighting..the ink should look like it is layered on top of the card, the colors may even appear layered atop each other. There will NOT be a uniform shiny gloss on real ones, although certain colors may appear to be more glossy than others.
I believe David Rudd's book or web-site describes this better than I along with other facets and distinguishing tell-tales of stone lithography