Definición

• Bulla.  A seal, usually lead and suspended by a cord attached to a document. The bulla bore a design formed by pressing an engraved seal die into the lead. The die was intaglio so the bulla would appear as a positive image. Papal bullas were lead seals affixed to religious papers; more important treaties bore silver (made  by softening the silver first) or in very rare instances for the most important documents, gold bullas.

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

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