Blotter rolls or books are not my favorite thing , however, there have been occasions when it was necessary to use a book. this was 16 x20 book, placed prints in it and clamped it shut between two pieces of board. Came back a week later to remove. This time factor came about due to experimention. Don't get in a hurry to sneak a peak. Over washing can lead to problems, the paper becomes too soft and picks up stuff from the blotter paper. Not a pleasant sight.