Ames, Typographical antiquities, 1749 (4I4v)

This blank verso unsurprisingly shows bleed-through from the recto's errata list and binder instructions. But it also shows off-set ink from the index: notice the columns of text and the heading. If you look closely above the bleed-through of "Directions" you can see a series of numbers starting "263, 300, 304"; next to the bleed-through you can see a series of "S"s lined up vertically, suggesting that this is part of the "S" entries. If you turn to sig. 4I1r, you'll see an entry for John Skelton that matches these characteristics. In a quarto, pages 1r and 4v are both on the outer forme, and so when those sheets were hung to dry, the ink from one page could easily transfer to another, as we see here.

Apian, Cosmographicus, 1524 (H4v)

In this middle of this page, and obscuring some text, is the string and paper securing the discs of the volvelle on the other side of this leaf.

Beaumont and Fletcher, Philaster, 1661 (A1v)

On this verso of a title page, the publisher has included a list of his publications for sale.

Behn, Widdow Ranter, 1690 (A4r)

This list of actors and roles uses a range of typographical techniques, including columns and typefaces, to present different categories of information.

Behn, Widdow Ranter, 1690 (A4v)

This list of items also sold by this playbook's publisher include other plays as well as novels, with some including the format and the price of the work.

Boethius, Arithmetica, 1492 (2a1r)

This edition of Boethius uses a title label on the first page of the book to provide a quick identification of the text.

Boethius, Arithmetica, 1492 (2l8r)

On this last leaf of text, the printer has included both a colophon identifying who printed the book and a register of the last words printed on the first four leaves in each gathering of the two-volume set.

Dodoens, Florum, 1568 (C8v)

This illustration of a corn-cockle is printed with a woodblock now owned by the Museum Plantin-Moretus and

Donne, Juvenilia, 1633 (F1v, raking light)

Imaged under a raking light, this blank page reveals a great deal more texture than images usually do, including wrinkled (or cockled) paper, vertical wire lines, the bite of type as it pushes out the paper from the other side, and the bite into the paper from some uninked (or blind) type in the middle of the page ("These eleven Paradoxes"). Some copies of this edition have this imprimatur inked and legible; others, like this one, seem not to have included it, although the type was clearly left in the forme even if it didn't print. (Compare this image to the one under usual flat lighting to see how different lighting shapes what we see.)

Donne, Juvenilia, 1633 (F1v)

This blank page is surprisingly busy. There's ink bleeding through from the other side (you can see the running title "PARADOXES" at the top and the signature mark "F" at the bottom of the page) but there's also offset from the facing page ("PROBLEMS", the title of the next section). It can sometimes be hard to tell the difference between bleed-through and offset in digital images if you can't also see the facing page, but one clue is to look for different colored ink. But if you look at this page under raking light, you'll see there's even more going on than is apparent in this image.