Today I Learned (TIL)

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TIL of the Poison Book Project, an effort to identify and catalogue books that were printed in the 19th century using arsenic compounds and “Paris green,” and are poisonous to researchers and libr... (en.wikipedia.org)

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The original was posted on /r/todayilearned by /u/whistleridge on 2025-07-12 20:05:48+00:00.

Original Title: TIL of the Poison Book Project, an effort to identify and catalogue books that were printed in the 19th century using arsenic compounds and “Paris green,” and are poisonous to researchers and librarians

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