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Parchment is a thin material made from calfskin, sheepskin or goatskin. Its most common use is as the pages of a book, codex or manuscript. It is distinct from leather in that parchment is not tanned, but stretched, scraped, and dried under tension, creating a stiff white, yellowish or translucent animal skin. The finer qualities of parchment are called vellum. It is very reactive with changes in relative humidity and is not waterproof. According to the Roman Varro, Pliny's Natural History records (xiii.21), parchment was invented under the patronage of Eumenes of Pergamum,[1] as a substitute for papyrus, which was temporarily not being exported from Alexandria, its only source. Writing on prepared animal skins had a long history, however. Some Egyptian Fourth Dynasty texts were written on parchment. Though the Assyrians and the Babylonians impressed their cuneiform on clay tablets, they also wrote on parchment from the 6th century BC onward. Rabbinic culture equated a "book" with a parchment scroll. Early Islamic texts are also found on parchment. One sort of parchment is vellum, a word that is used loosely to mean parchment, and especially to mean fine parchment, but more strictly refers to parchment made from calf skin (although goat skin can be as fine in quality). The words "vellum" and "veal" come from Latin vitulus, "calf", or its diminutive vitellus. In the Middle Ages calfskin and split sheepskin were the most common materials for making parchment in England and France, while goatskin was more common in Italy. Other skins such as those from large animals such as horse and smaller animals such as squirrel and rabbit were also used. Whether uterine vellum (vellum made from aborted calf fetuses) was ever really used during the medieval period is still a matter of great controversy.
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