How using sheepskin for legal papers may have prevented fraud
Processing out the fat created a writing surface easily marred by scratched-out words

This deed, involving ownership of land in Enfield, England, was written on parchment made from sheepskin and signed and sealed on January 15, 1499. Tampering with the ink on sheepskin would tear apart the layers of the skin, leaving a blemish on the parchment.
Dave Lee