Ologies with Alie Ward

Historical Toxicology (OLD TIMEY POISONS) with Deborah Blum

October 29, 2025

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  • The terms "toxin" and "poison" are not interchangeable, as toxins generally refer to plant or naturally occurring poisons, while metallic poisons like arsenic are chemically distinct. 
  • Arsenic was historically the 'gold standard' homicidal poison due to its tastelessness, odorless nature, and ability to mimic symptoms of common chronic illnesses, leading to its widespread use until forensic detection methods like the Marsh test were developed. 
  • The historical association of poison as a 'woman's weapon' stems from the fact that, historically, women often chose poison (which required planning and access to household substances) as a means of self-defense or rebellion against powerless situations. 
  • The historical use of poison often served as a means of self-defense and rebellion, particularly for Indigenous groups whose generational knowledge was systematically suppressed. 
  • The fictional concept of building tolerance to poisons like iocaine powder, popularized in *The Princess Bride*, is mythologically based on the historical, but false, belief that micro-dosing arsenic could build immunity. 
  • Chronic exposure to arsenic is detrimental, weakening the immune system, and while tolerance (habituation) occurs with substances like alcohol and opioids, it does not apply to building immunity against poisons like arsenic. 

Segments

Poison vs. Venom Distinction
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(00:08:12)
  • Key Takeaway: Toxins generally refer to plant or naturally occurring poisons, excluding mineral poisons like arsenic, while venom requires an injection apparatus.
  • Summary: Toxins are distinct from poisons, specifically referring to plant-derived or naturally occurring poisons, not mineral poisons like arsenic or antimony. Venom is defined by its delivery via injection into a host, contrasting with poison which can be ingested. If venomous material is eaten rather than injected, it acts as a poison, though stomach acid may denature proteins like venom.
Arsenic vs. Cyanide Mechanisms
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(00:13:53)
  • Key Takeaway: Metallic poisons like arsenic bioaccumulate in the body, often mimicking chronic illness symptoms, whereas plant alkaloids like cyanide are volatile and cause rapid, conspicuous death.
  • Summary: Metalloid poisons such as arsenic store in the body, often depositing in bones, allowing for gradual dosing that mimics natural illness symptoms like gastric upset. In contrast, plant alkaloids like cyanide are volatile, cause rapid neurotoxic effects, and are often bitter, making them less inconspicuous than tasteless arsenic. Arsenic was historically favored for murder because its symptoms were familiar to doctors treating infectious diseases.
History of Arsenic Detection
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(00:31:17)
  • Key Takeaway: The Marsh test, developed around 1838-1839, was the first reliable chemical method to detect arsenic in a human body by forming a reflective black ‘arsenic mirror’ on glass.
  • Summary: Before the 1840s, poison detection was rudimentary, sometimes involving feeding stomach contents to dogs to observe effects. James Marsh developed his test after being taunted by a murderer who escaped conviction due to lack of evidence. The Marsh test specifically targeted metallic poisons like arsenic and antimony, but could not detect plant alkaloids until the 1870s.
Modern Toxicology and Detection
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(00:40:41)
  • Key Takeaway: Modern toxicology utilizes advanced techniques like gas chromatography to measure chemical wavelengths in small tissue samples, allowing for rapid, simultaneous detection of many substances.
  • Summary: Modern toxicology can detect many substances quickly and at very low levels using machines like gas chromatographs, which measure chemical wavelengths. However, detection still relies on knowing what to test for, as evidenced by a case where cyanide poisoning was only identified after a doctor noticed the patient’s muscles were oxygen-starved (lactic acidosis). Alexander Gettler pioneered early 20th-century toxicology by establishing the first scale of intoxication based on alcohol levels found in 8,000 post-mortem brains.
Fictional Poisons and Movie Myths
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(00:45:55)
  • Key Takeaway: Fictional portrayals of poisons, such as cyanide destroying teeth or causing instantaneous death in The Princess Bride or spy capsules, are often scientifically inaccurate.
  • Summary: Deborah Blum expressed annoyance that cyanide capsules in spy movies are often depicted as destroying teeth, which is chemically inaccurate as cyanide is only a very mild acid. Furthermore, acute cyanide poisoning does not typically result in death within two seconds, contrary to dramatic film depictions. Iocaine powder, while a great fictional poison, is based on old mythology surrounding arsenic.
Poison as a Weapon of the Powerless
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(00:54:35)
  • Key Takeaway: Historically, poison was considered a ‘woman’s weapon’ because it was a necessary, less confrontational tool for self-defense and rebellion when women lacked legal rights like property ownership or divorce.
  • Summary: In the 19th century, women chose poison about ten times more often than men, leading to legislative proposals like banning women from purchasing arsenic. Historians refer to poison as ’the great equalizer’ because, before legal rights were granted (e.g., the Equal Credit Opportunity Act in 1974), it was often the only defense against abusive spouses or employers. While women historically favored poison, men commit more total poison murders due to the higher overall number of murders they commit, typically using firearms.
Poison as Self-Defense
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(01:04:20)
  • Key Takeaway: Poison use historically reflects self-defense and rebellion, exemplified by Native Americans using plant poisons against settlers.
  • Summary: Poison has consistently served as a tool for self-defense and rebellion throughout history. The Cherokee, for instance, posed a threat to settlers due to their access to plant poisons. The suppression of Indigenous language and generational knowledge limited the passing down of such traditions.
Iocaine Powder Myth Debunked
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(01:05:04)
  • Key Takeaway: Iocaine powder from The Princess Bride is fictional, but the idea of building tolerance is based on old arsenic mythology.
  • Summary: Iocaine powder, described as odorless and instantly dissolving, does not exist. The concept of building immunity through micro-dosing is based on an old, incorrect belief about arsenic. Chronic exposure to arsenic actually weakens the immune system rather than building tolerance.
Substance Habituation Explained
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(01:06:56)
  • Key Takeaway: Tolerance (habituation) is chemically real for substances like alcohol and opioids, but not for toxins like arsenic.
  • Summary: Chemical compounds can cause habituation through repeated exposure, such as the increased efficiency of liver enzymes breaking down alcohol in chronic drinkers. This is tragically true for opiates, where loss of tolerance after detoxification leads to increased overdose mortality upon relapse. This habituation mechanism does not apply to building protection against poisons like arsenic.
Cyanide in Health Foods
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(01:09:06)
  • Key Takeaway: Cyanide occurs naturally in seeds and pits of many plants, including elderberry, leading to accidental poisoning from overconsumption.
  • Summary: Bro science suggesting daily micro-doses of cyanide for fitness gains is dangerous. Cyanide exists as glycocyanides in peach pits, apple seeds, apricot pits, and elderberry. One individual developed low-level cyanide poisoning from taking elderberry daily as a health supplement.
Poisoning as Premeditated Crime
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(01:10:18)
  • Key Takeaway: Poisoning is typically the coldest form of premeditated homicide, requiring patience and research, unlike impulsive violence.
  • Summary: Poisoning is characterized by patience and requires the perpetrator to know what they are doing, contrasting sharply with impulsive acts of violence. Researching the best delivery method for a poison demonstrates a lack of impulse in the act. The aftermath of murder, including the resulting family secrecy, can be more traumatic than the murder itself.
Impact of Historical Poisonings
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(01:11:13)
  • Key Takeaway: The suffering caused by historical poisonings casts a long shadow, profoundly shaping families for generations.
  • Summary: The author focuses on the aftermath of murder, citing the story of Lillian Katz, a stenographer killed in an arsenic-laced bread dough incident. Her mother’s guilt over not insisting on a packed lunch illustrates the enduring trauma inflicted on survivors. One descendant’s family mystery was solved by the book, revealing that the loss of their great aunt shaped the family’s subsequent century, including their rejection of faith.
Post-Publication Reader Interactions
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(01:15:07)
  • Key Takeaway: The book prompted readers to seek advice on investigating potential historical family poisonings, sometimes involving hair testing.
  • Summary: The author occasionally advises writers of murder mysteries on poison usage. Following the book’s release, people contacted the author with suspicions of family members being poisoned, sometimes attempting to retrieve physical evidence like hair for testing before cremation. In such cases, the author directs people toward local toxicologists to discuss symptoms and testing options.