"Paper came before its time and had to wait for recognition. It was sorely needed. The Egyptian manufacture of papyrus, which was in a state of decay in the seventh century, ceased entirely in the ninth or tenth. Not many books were written during this period, but there was then, and for at least three centuries afterwards, an unsatisfied demand for something to write upon. Parchment was so scarce that reckless copyists frequently resorted to the desperate expedient of effacing the writing on old and lightly esteemed manuscripts. It was not a difficult task. The writing ink then used was usually made of lamp-black, gum and vinegar; it it had but a feeble encaustic property, and it did not bite in or penetrate the parchment. The work of effacing this ink was accomplished by moistening the parchment with a weak alkaline solution and by rubbing it with pumice stone. This treatment did not entirely obliterate the writing, but made it so indistinct that the parchment could be written over the second time. Manuscripts so treated are now known as palimpsests. All the large European public libraries have copies of palimpsests, which are melancholy illustrations of the literary tastes of many writers or bookmakers during the Middle Ages. More convincingly than by argument they show the utility of paper. Manuscripts of the Gospels, of the Iliad, and of works of the highest merit, often of great beauty and accuracy, are dimly seen underneath stupid sermons, and theological writings of a nature so paltry that no man living cares to read them. In Some instances the first writing has been so thoroughly scrubbed out that its meaning is irretrievably lost. "Much as paper was needed, it was not at all popular with copyists; their prejudice was not altogether unreasonable, for it was thick, coarse, knotty, and in every way unfitted for the display or ornamental penmanship or illumination. The cheaper quality, then known as cotton paper, was especially objectionable. It seems to have been so badly made as to need governmental interference. Frederick II, of Germany, in the year 1221, foreseeing evils that might arise from bad paper, made a decree by which he made invalid all public documents that should be put on cotton paper, and ordered them within two years to be transcribed upon parchment. Peter II, of Spain, in the year 1338, publicly commanded the paper-makers of Valencia and Xativa to make their paper of a better quality and equal to that of an earlier period.