This report contains no data on how the pearls were cleaned (for want of a better word).
The pearls were found in a lead box and the cleaning process took 1year.
They had to soak the pearls in salt water for nearly the full year and then the final step is to use electrolysis to remove any remaining lead.
Apparently there was some concern about breakdown of the pearls but the cleaning process was a success.
This was how it was explained to me earlier today.
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