Marie Lafarge was a reluctant bride who was accused of murdering her husband in the late 1830s by poisoning him with arsenic. At the time the arsenic tests were often inconclusive, and murderers could get off by sowing doubt in the minds of jurors about the methods used for detection. But the Marsh test changed all that since was a much more definitive test for arsenic. The ups and downs of this case will amaze you.

Sources and resources:

Video of the Marsh test: https://www.youtube.com/watch?v=DKE18vfV314

https://daily.jstor.org/the-arsenic-cake-of-madame-lafarge/

http://scihi.org/marie-lafarge/

https://www.encyclopedia.com/women/encyclopedias-almanacs-transcripts-and-maps/lafarge-marie-1816-1852

https://en.wikipedia.org/wiki/Marie_Lafarge

https://www.amusingplanet.com/2022/11/marie-lafarge-arsenic-poisoner.html

https://www.historicalstatistics.org/Currencyconverter.html

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minor-key-music-box by user darkwaryurmc (http://freesound.org/s/318908/) licensed under CCBYNC 4.0

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Cover art photos: photo, public domain.