As I mentioned before, I will be adding to my book (over the next year) 31 full page illustrations that were drawn and printed by hand. I'll be gluing in the illustration along its top onto the placeholder page that's reserved for it. This process is called "tipping in" the illustration. You can see it in old art
books before digital printing became the norm. (The caption for the illustration is already printed on the book page.)
I've just cut glassine sheets (thin, transparent paper) to insert between the tipped in prints and the facing page. That will protect the book page from any ink that comes off the tipped in print. Since the tipped in print will be a separate piece of paper that's raised up above the book page underneath it, it will be subjected to a lot more friction. The glassine sheets will be sewn into the binding of the folio just like the regular pages.
I'm now cutting the print inserts. Half are done. More accurately, I'm tearing them with a tear bar. It produces what's called "a deckle edge" and is a clear indication that the print on that paper is probably hand-printed. Even though I don't have prints on them, I need to use them as placeholders. They take up space and I need to know how much in order to make the wood for the spine thick enough. Plus, when I sew together the folios, there will be room in the stitching for me to put the prints in place later. (Or, at least, that's the theory.)
Back to tearing! If it doesn't work, I'll be tearing it out and tearing up.