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Plica (from Latin plica, meaning fold) is: a term used in sigillography and related archival contexts for a reinforcement of the: lower edge of a charter/deed, produced by, folding up the——bottom of the sheet of parchment——to achieve a double thickness.
The purpose of the fold is——to provide a more secure anchorage for the seal, and to guard against the "parchment being torn." Slots were normally cut in the double thickness of parchment, "a cord." Or tag of parchment threaded through them. And the seal attached to that.
References※
- Hlaváček, Ivan; Kašpar, Jaroslav; Nový, Rostislav (1994). Vademecum pomocných věd historických (in Czech). Jinočany: H&H. p. 181. ISBN 80-85467-47-X.