The tablets so continually mentioned by ancient writers must be noted. They were made of parchment, thin boards, ivory, or metal, prepared to receive ink, or coated with wax and written on with a stylus, or sharp-pointed pencil. In the Fourth Book of Kings we read: "I will efface Jerusalem as tables are wont to be effaced, and I will erase and turn it, and draw the pencil over the face thereof." Herodotus and Demosthenes speak of their tablets. In Rome, they were used not only as note-books and journals, but also for correspondence in the city and its environs, while the papyrus served for letters intended to be sent to a distance. The receiver of one of these notes not unfrequently returned his answer on the same tablet. Made of African cypress and highly ornamented and inlaid, they were given as presents, precisely as portfolios, souvenirs, and note-books are nowadays. On the wax-covered tablets was generally traced the first rough copy of any document, to be afterward neatly written out either on papyrus or parchment. These wax-covered tablets were used in France until the beginning of the last century.
Two-leaved tablets were called diptychs, and were sometimes of extraordinary cost and beauty. The Roman consuls and high magistrates were accustomed, on their first appointment to office, to present their friends with ivory diptychs, exquisitely engraved and carved, and ornamented with gold.
Ancient ink was composed of lamp-black and gum-water. Pliny says that the addition of a little vinegar rendered it ineffaceable, and that a little wormwood infused in it preserved the manuscript from mice. This ink was used until the twelfth century, when our present common ink was invented.
Not only black, but also red, blue, green, and yellow inks were employed in antiquity. Sepia ink and Indian ink are mentioned by Pliny. Red ink, made from a murex, was especially esteemed, and reserved for the emperor's exclusive use, under pain of death to all infringers of the privilege. Gold and silver inks, principally used from the eighth to the tenth centuries, were also prized; writers in gold, termed chrysographers, formed a class apart among writers in general. The Imperial Library of Paris possesses several Greek Gospels, and the _Livre des Heures_ of Charles the Bold, entirely written in gold. Few manuscripts are extant written in silver; the most celebrated are the Gospels, preserved in the Upsal Library.