The Codex Eyckensis, an 8th-century illuminated manuscript on parchment, was freed from its poly(vinyl chloride) lamination, applied in 1957. Many single sheets and bifolios needed to be conserved, especially in the spine regions and on the edges. Rebinding could only be considered if bifolios and, hence, quires could be restored by soft mechanical means. Aqueous suspensions prepared from hide powder, combined with paper fibers or calcium carbonate, or preliminary suspensions derivatized with formaldehyde, were used to produce sheets of reconstituted parchment. These were tested for their physicochemical properties (acidity and opacity) and mechanical properties (tensile, tear, and thread tear strength) after aging. A fragment of old degraded parchment was leafcast with formaldehyde-treated parchment pulp. The reconstituted parchment proved to be mechanically strong and to be rather weakly bound to the original parchment, unless the contact zone was covered with goldbeaters' skin. The mixtures finally selected contained only minor quantities of modifying agents (less than 20% by weight) and proved to be valuable materials for parchment leafcasting.