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Dating The Royal Seal With Geology And Patina
The seal was subjected to a series of laboratory tests that showed it was sealed on a linen cloth, when its material was in a relatively dry state, and then baked at a temperature of about 750 degrees Celsius (1382 degrees Fahrenheit). Testing the bulla (medieval Latin for a round seal ; plural bullae), the team was able to ascertain that it had come from a place where “limestone rocks are exposed in the vicinity of basalt-containing olivine.”
Goren said he and the other researchers studied “hundreds of securely identified bullae from legal excavations to get a reference point.” The geologists were able to successfully narrow down the possibilities to areas in the Lower Galilee, and the Jezreel and Beit She’an valleys. ....

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