Victorian Forensic Science and Poisons Quiz

Answer: A silvery black deposit

Arsenic was immensely popular as a poison in the 19th century, even earning the nickname "Inheritance Powder". White arsenic trioxide was cheap, easily bought in apothecaries, entirely tasteless and odorless when mixed into food or drink, and produced stomach symptoms that doctors routinely misdiagnosed as natural illnesses like cholera.

Developed by British chemist James Marsh in 1836, the Marsh test solved the problem of proving poisoning in court by combining suspected stomach tissue or liquid with zinc and acid, converting any trace arsenic into a combustible gas. When this gas was ignited and directed against a cold piece of porcelain or glass, it left behind a distinct, shiny, metallic black deposit. This outcome provided undeniable visual evidence for juries.

Answer: Heavy metals

The Reinsch test is a fast, straightforward method used by toxicologists to screen human biological samples, such as stomach contents or urine, for dangerous heavy metals like mecury, antimony, bismuth, and arsenic. To perform the test, a scientist takes a piece of suspected tissue or liquid, mixes it with hydrochloric acid, drops a clean strip of shiny copper wire directly into the container, and boils the mixture for about 45 minutes. If heavy metals are present in the sample, a chemical reaction causes the metal atoms to bind directly to the copper surface, leaving a visible coating or film on the wire.

A dark gray or black coating typically signals arsenic or antimony, while a shiny silvery coating indicates mercury. Because it requires very little specialized equipment and gives quick visual results, Victorian-era investigators heavily relied on it as an initial field test to determine whether a full, time-consuming chemical analysis was necessary.

Answer: Corpse decomposition

In late 1800s toxicology, defense attorneys frequently used "ptomaine defenses" to create reasonable doubt and get accused poisoners acquitted. As a human body naturally decomposes after death, decaying proteins break down under bacterial action into chemical compounds called ptomaines or cadaveric alkaloids. The issue for Victorian forensic chemists was that these decomposition byproducts reacted to chemical testing agents in the same way as deadly plant poisons like atropine, morphine, or strychnine.

Because early toxicology tests could not cleanly distinguish between a toxic plant extract deliberately given to a victim and the harmless chemical traces left by a decaying body, defense lawyers repeatedly argued that prosecution scientists had simply mistaken the body's natural post-mortem decay for a murder weapon.

Interestingly, by the 1920s and 1930s, scientists proved that ptomaine poisoning was actually a myth. Ptomaines themselves are generally harmless in tiny amounts, and meat would have to be so rotting and putrid for deadly amounts to form that no human would eat it. The real culprit behind food poisoning was bacterial infection or bacterial toxins and not the ptomaine compounds themselves.

Answer: Maintaining a Poison Register

Passed to slow Britain's rampant, unregulated poison trade, the Pharmacy Act of 1868 aided crime detection by restricting the sale of deadly substances strictly to qualified apothecaries and pharmaceutical chemists. Under this law, deadly poisons like arsenic, cyanide, strychnine, and belladonna were categorized, requiring merchants to clearly label bottles with the word "Poison" and the shop's name.

Crucially, for the most lethal compounds, the law required a mandatory Poison Register, a bound logbook where the chemist had to record the date of purchase, the buyer's name, address, occupation, the specific quantity sold, and the buyer's stated purpose for needing it (such as killing rats or clearing garden weeds). In many cases, the purchaser even had to sign the ledger alongside a witness known to the apothecary. This created a paper trail for investigators. Whenever a suspect was accused of foul play, detectives could inspect local pharmacy ledgers to see if, when, and why the accused had bought the exact toxin found in the victim's body.

Answer: Precise body measurements

Developed in 1879 by French police clerk Alphonse Bertillon, Bertillonage (or anthropometry) was a scientific system for identifying repeat criminals before fingerprinting became standard. The system operated on the principle that, while human height and features change, adult bone structures remain virtually constant. Police officers used specialized calipers and gauges to record 11 precise physical measurements. These statistics included head length and width, the length of the left middle finger, the left foot, and the forearm.

These were added alongside standardized front and profile photographs of the person (the invention of the modern mugshot). These statistics were then cataloged onto index cards, allowing police to cross-reference a suspect's physical profile against police archives and unmask repeat offenders using false names. Though ground-breaking across late-Victorian Europe and North America, the complex system proved tedious, prone to clerical measurement errors, and was ultimately abandoned in the early 1900s when fingerprinting proved far simpler and more reliable.

Answer: Cat

In the famous 1893 trial of Dr. Robert Buchanan, a cat was used for a dramatic courtroom demonstration. Dr. Buchanan was accused of poisoning his wealthy wife with a lethal overdose of morphine. Knowing that a typical morphine overdose left telltale pinpoint pupils that doctors looked for, Buchanan boasted he could avoid detection where other killers failed. To mask the constricted pupils, he placed drops of atropine (derived from belladonna) into his wife's eyes shortly before she died.

To prove this to a transfixed jury, prosecution toxicologist Dr. Rudolph Witthaus brought a live cat into the courtroom, injected it with morphine to demonstrate how its pupils narrowed to tiny pinpoints, and then dropped belladonna extract directly into the cat's eyes. The jury watched as the pupils immediately widened back out. Corroborated by a attending nurse who recalled seeing Buchanan leaning over his dying wife to apply eyedrops, the live demonstration convinced the jury that belladonna had been used as a tool to cover up a murder.

Answer: Blood

In 1863, Christian Friedrich Schonbein, the same pioneering chemist who discovered ozone, realized that hydrogen peroxide reacted with the hemoglobin in red blood cells to produce an oxidizing effect. By mixing suspect crime scene stains with a resin from the guaiacum tree and adding hydrogen peroxide, the mixture immediately turned a bright, unmistakable blue if hemoglobin was present.

This marked the birth of modern presumptive chemical testing for blood. However, while Schonbein's test gave Victorian detectives a fast way to confirm a stain was actually blood, it had a famous legal drawback. It could not distinguish between human blood and animal blood, leaving a massive loophole that defense lawyers exploited until species-specific tests were developed at the turn of the century.

Answer: Plaster of Paris

In late Victorian crime investigation, preserving fragile, physical tracks on soft earth before weather or foot traffic destroyed them became a major forensic priority. Detectives began using plaster of Paris which is a fast-hardening slurry made from heated gypsum powder.

They used it by carefully pouring it into mud, dust, or snow prints at a murder scene. Once dried, the solid 3D mold could be lifted out, cleaned, and brought directly into a courtroom. Investigators used these detailed casts to examine specific hobnail boot patterns, heel wear, cobbler repair marks, or bicycle tire treads, matching a suspect's footwear to the physical evidence left behind.

Answer: Spectroscope

Developed in 1859 by Gustav Kirchhoff and Robert Bunsen, the spectroscope revolutionized Victorian science by analyzing the unique dark absorbing lines (spectral lines) that elements and molecules produce when light passes through them.

In the 1860s, forensic pioneer Henry Sorby adapted the spectroscope to crime scene analysis, discovering that blood diluted in liquid produced distinct dark bands in the light spectrum that no other substance could mimic. This allowed Victorian toxicologists to prove the presence of microscopic amounts of blood, carbon monoxide poisoning, or specific chemical toxins in heavily contaminated samples (even if the liquid was dark, foul, or decomposing) without wasting or destroying the tiny amount of evidence they possessed.

Answer: Sharply raised ridges, spikes, or cobweb patterns

In the 19th century, households kept medicine, tinctures, and lethal household poisons like carbolic acid, strychnine, or cyanide all together on dark pantry shelves. Because many Victorians lacked gas lighting or were reaching into medicine chests in the middle of the night, accidental poisonings were widespread.

Glassmakers solved this by producing specialized poison bottles in bright cobalt blue, deep green, or amber glass, molded with unmistakable tactile warnings such as sharp diamond ridges, raised vertical grooves, protruding spikes, or even embossed skulls and cobwebs. The intent was that, even if a sleepy or visually impaired person reached into a cupboard in pitch darkness, the rough, prickly sensation of the glass instantly warned them that the bottle contained a deadly substance rather than cough syrup.