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In page Parchment:

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In the later Middle Ages, especially the 15th century, parchment was largely replaced by paper for most uses except luxury manuscripts, some of which were also on paper.[6] New techniques in paper milling allowed it to be much cheaper than parchment; it was made of textile rags and of very high quality.[citation needed] Following the arrival of printing in the later fifteenth century AD, the supply of animal skins for parchment could not keep up with the demands of printers.[6]