Verso; Photograph of the verso of the fragment, showing layers of thick strips of vegetable fiber. Although layers of recycled papyrus made up many of the ancient book boards, some boards had clumps of other fibers, grasses and rushes. T. C. Petersen, who studied many Coptic binding fragments, theorized that some of the later boards were composed of fiber pulp that was literally cast in a book board shape while wet.
