Scientists can detect fake ancient pottery by testing how much heat it takes to erase the weak magnetic memory stored in the clay over time.
How the Magnetic Test Works
▫️Magnetic buildup: When clay is first fired in a kiln, it locks in a strong magnetic signal matching Earth's field. Over centuries, a weaker secondary magnetic signal—called viscous magnetization—slowly builds up.
▫️The 112°C rule: Researchers from Scripps Institution of Oceanography found that pottery older than 1,000 years keeps this slow-building magnetic memory until it is heated above 233°F (112°C).
▫️Spotting fakes: Modern ceramics and recent forgeries lose that same magnetic memory at much lower temperatures.
Why This Discovery Matters
▫️Advanced computing: While geoscientists knew about magnetic traits for decades, new micromagnetic computer models finally allow scientists to simulate particle behavior over deep time.
▫️Fighting fraud: Led by researcher Yoav Vaknin, the team successfully tested the approach on suspicious items and exposed modern fabrications versus genuine ancient artifacts.
▫️Museum use: Curators and law enforcement can use this method to clear up doubts about murky origins and stop the illegal trade of looted antiquities.
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