The National Library of France has now quarantined these books for analysis to determine the level of arsenic in the covers.
Melissa Tedone mentioned that emerald green was a popular colorant in Victorian-era book bindings and posed health risks, including arsenic in some cases.
In 2019, Tedone found that over 10% of tested books contained arsenic-laced emerald green, highlighting a significant health risk for librarians.
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