Bulla Seals
Throughout the excavations in Israel, bullae or seal impressions were found, many times carrying names of Biblical figures.
A Bulla is a seal impression that was used to seal documents. The seal impression was usually made by a signet ring carrying the reverse letters so that the letters will read properly when impressed on a piece of clay.
These clay impressions would have eventually disintegrated after a few hundred years. However, the immense heat of the destruction of Jerusalem "baked" and hardened these seal impressions, preserving them, and making them discoverable in the present day.
Overview
A Bulla is a seal impression that was used to seal documents as a form of authentication and tamper-proofing. The seal impression was usually made by a signet ring carrying the reverse letters so that the letters will read properly when impressed on a piece of clay.