in terms of 19th century cards
without accepting the practice of soaking them in water (what I'm comfortable with in terms of application and what I believe the majority accepts at least up to this point) likely more than 75% of the cards in the marketplace would have to be entombed adhered to tobacco album pages (and scrapbooks) and would result in a defacto inability to see anything on their backs. The percentage obviously smaller in most T sets but that's a lot of cards!
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