The popular coverage: https://www.scientificamerican.com/article/ancient-roman-lead-melted-down-explore-frontiers-physics/ https://www.scientificamerican.com/a

The popular coverage: https://www.scientificamerican.com/article/ancient-roman-lead-melted-down-explore-frontiers-physics/ https://www.scientificamerican.com/article/ancient-roman-lea... I saw a talk on one of these experiments while I was a grad student. Apparently their lead source had "historical significance" according to the government of France, and getting it out of the country required beurocratic maneuvers of questionanable legality.