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Different Easter traditions around the world
The significance of Easter eggs and bunnies in modern culture
The importance of the holiday in the Christian faith
Medieval and early modern fraud-prevention technique
Experts have identified the species of animals used for British legal documents dating from the 13th to 20th century, and have discovered they were almost always written on sheepskin, rather than goatskin or calfskin vellum.
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Why?
Sheep deposit fat in-between the various layers of their skin. During parchment manufacture, the skin is submerged in lime, which draws out the fat leaving voids between the layers.
Attempts to scrape off the ink would result in these layers detaching—known as delamination—leaving a visible blemish highlighting any attempts to change any writing.
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The fat content played a key role
Sheepskin has a very high fat content, accounting for as much as 30 to 50 percent, compared to 3 to 10 percent in goatskin and just 2 to 3 percent in cattle. Consequently, the potential for scraping to detach these layers is considerably greater in sheepskin than those of other animals.
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And it continued for centuries
The continuing use of sheepskin over goat or calfskin in later centuries was likely influenced by their greater availability and lower cost.
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