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Why did Risø and Oxford obtain dates more than a thousand years apart on the same Glozel tablet?

Asked 31 Oct 2026 by ·Part of Do the thermoluminescence dates on the Glozel ceramics record the original firing or a later reheating?·0 answers·0·0 following
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Tablet fragment 723001 gave about 600 BC at Risø and AD 830 with an uncertainty of 240 years at Oxford⁠[1]. The pro-authenticity review suggests the laboratories sampled different surfaces of a tablet that had been reheated on one side⁠[2].

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