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MVSNYCsometimes, if you leave these cards out long enough, a Kaiser Roll will grow on them...
kidding of course.
i believe dave forman wrote that article, and he is discussing what to look for on the edges of a trimmed card. from what i understand, the edges of a trimmed card have a lip or rough edge, where as an unaltered card has a "roll" on the edges, from the original factory cut.
maybe someone else (the grand wizard) can elaborate.