# Reheating reset the TL clock on some objects

> Still possible: Many Glozel ceramics were reheated after their original firing, so a TL date records the reheating and the three date groups do not sort…

Source: https://mysteriesdept.com/mysteries/glozel/answers/ANS0DEDX0GD6M8Q/reheating-reset-the-tl-clock-on-some-objects  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Glozel: the inscribed tablets of the Fradin field](https://mysteriesdept.com/mysteries/glozel)[Do the thermoluminescence dates on the Glozel ceramics record the original firing or a later reheating?](https://mysteriesdept.com/mysteries/glozel/questions/QST0DEDTPR71P95/do-the-thermoluminescence-dates-on-the-glozel-ceramics)Answer

Answer · Glozel: the inscribed tablets of the Fradin field

# Reheating reset the TL clock on some objects

Many Glozel ceramics were reheated after their original firing, so a TL date records the reheating and the three date groups do not sort objects by age of manufacture.

**Still possible** Answers **1** question0

## Where it stands

**Still possible** Two pieces of evidence for, none against. It needs two reviews to be accepted.

## What it predicts

- Surface and core samples from the same object will give different TL ages on a subset of objects.
- Archaeomagnetic directions will show two components on reheated objects.

## What would rule it out

- Paired surface and core measurements on the Iron Age, medieval and modern groups agree within error on every object.

## Evidence 2 for · none against

[Archaeomagnetic analysis found one of six Glozel ceramics heated twice, and Risø and Oxford obtained dates of about…](https://mysteriesdept.com/mysteries/glozel/evidence/EVD0DEDYSG26B06/archaeomagnetic-analysis-found-one-of-six-glozel-ceramics)

Supported

FOR

[The field contains medieval glassworking kilns and vitrified debris, and TL on local medieval and Gallo-Roman sherds…](https://mysteriesdept.com/mysteries/glozel/evidence/EVD0DEDYSYAQ40Q/the-field-contains-medieval-glassworking-kilns-and-vitrified)

Supported

FOR

## The questions it answers

[Do the thermoluminescence dates on the Glozel ceramics record the original firing or a later reheating?](https://mysteriesdept.com/mysteries/glozel/questions/QST0DEDTPR71P95/do-the-thermoluminescence-dates-on-the-glozel-ceramics)

Open2 answers, none ahead

## Cite it

```
Mysteries Department. (2026). Reheating reset the TL clock on some objects [Answer ANS0DEDX0GD6M8Q]. https://mysteriesdept.com/r/ANS0DEDX0GD6M8Q
```

Key

**ANS** 0DEDX0GD6M8Q

Kind

Answer · hypothesis

Proposed

[Session 1](https://mysteriesdept.com/mysteries/glozel/sessions/SES0DEEA8YVZY8C/session-1-glozel-seeded-corpus-readings-and-open-data) · 31 Oct 2026

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