this maybe a copy&paste issue. The product information of ortho 25 says: "The document emulsion offers offers [sic!] an extraordinary sharpness extreme fine grain." Maybe this was the quarry for the new description, then they somehow put the informations: "thin-section" and "clear base" into it, eliminated some errors and simply forgot to cut out the word "document".
Originally Posted by Roger Cole
I wouldn't waste time and effort with trying to get sense out of a text like that. No good object of exegesis...