After the late eleventh century, scribes began to move away from ruling in drypoint and toward the practice of ruling in plummet -- a type of leadpoint.  Graham and Clements suggest that the transition from drypoint to plummet occurred over several decades, and that "manuscripts ruled in drypoint can be found as late as the third quarter of the twelfth century" (17).  Rulings in plummet can be identified by their grey or reddish-brown coloration; the lines are generally thin and granular, and sometimes hardly visible. Unlike scribes who ruled in drypoint, scribes using plummet had to rule both sides of a leaf of parchment, and could not rule any more quickly than one side at a time, as the plummet did not bleed through or create an imprint in multiple leaves at once. Plummet did carry several advantages, however: there was very little chance, if any, of ruining a sheet of parchment by pressing too hard, and scribes could erase poorly drawn lines with little leftover marking.