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The 12th century text Dialogus de Scaccario—written by Richard FitzNeal, Lord Treasurer during the reigns of Henry II and Richard I—instructs the use of sheepskin for royal accounts as “they do not easily yield to erasure without the blemish being apparent”.
In the 17th century when paper was common, Chief Justice Sir Edward Coke wrote of the necessity that legal documents were written on parchment “for the writing upon these is least liable to alterations or corruption”.
From Sheepskin Parchment Helped Medieval Lawyers Prevent Fraud : Science Fiction in the News:
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