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What are Vellum and Vellum Paper ?
Webster describes vellum as a fine-grained un-split lambskin, kidskin, or calfskin prepared especially for writing on or for binding books or a strong cream-colored paper.
Vellum and parchment are materials prepared from the skins of animals. Strictly speaking, vellum is a finer quality of parchment prepared from calf skins, but the terms have been used interchangeably since the Middle Ages.
Vellum was originally a translucent or opaque material produced from un-split calfskin, and consequently had a grain pattern on one side (unless removed by scraping). Parchment was produced from the flesh split of a sheep or goat or other kind of skin, and consequently had no grain pattern. The important distinction between vellum (and parchment) and leather is that the former is not tanned but is prepared essentially by soaking the skin in lime and drying it under tension.
Historical Records using Vellum as a Writing Material
Ancient cultures used leather as a writing material before parchment. Egyptian sources refer to documents written on leather as early as 2450 BC. Most medieval manuscripts, whether illuminated or not, were written on vellum. The very best quality, Uterine vellum, was made from the skins of still-born or even unborn animals.
Buddhist texts were written on vellum. A quarter of the 180 copy edition of Johannes Gutenberg's first Bible printed in 1455 with movable type was also printed on vellum, presumably because his market expected this for a high-quality book.
Paper soon took over for most book-printing, as it was cheaper and easier to handle through a printing-press
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