The Bakery That Almost Killed a Colony: The 1857 Arsenic Loaf
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The Bakery That Almost Killed a Colony: The 1857 Arsenic Loaf
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Panic rippled through Hong Kong when a single bakery’s loaves sickened 300-500 people on January 15, 1857 - tests later found about 62-64 grains of arsenic trioxide per pound, a concentration lethal many times over, yet no one died. How could arsenic so concentrated force mass vomiting and spare lives, and who slipped poison into finished loaves minutes before they were baked?
In this episode, we tell the story of that morning, the bakery at the center of the crisis, the tests and the emergency response, and the unanswered questions that followed: why the poison failed to kill and why the accused man walked free.
Person: Cheong Ah-lum
Date: January 15, 1857
Location: Hong Kong
Event: Mass arsenic poisoning from Esing Bakery loaves
Analysts: Murray and Liebig
- Between 300 and 500 European residents were violently ill by the end of January 15, 1857.
- Chemist Murray measured 62.3 grains of arsenic trioxide per pound of bread.
- Analyst Liebig measured 64 grains of arsenic trioxide per pound of bread.
- Surgeon General Aurelius Harland ordered inducing vomiting and consuming raw eggs as emergency treatment.
- Cheong Ah-lum left for Macau the morning of January 15, was arrested and later acquitted, and died in 1900 without ever being convicted.
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