Overview

Zyklon B was the trade name of a commercial fumigant developed in Germany in the early 1920s. As sold, it consisted of hydrogen cyanide (HCN) stabilized on a carrier material and packaged for use in disinfection and pest control. It is historically significant both for its intended commercial role as a pesticide and for its later, criminal use by the Nazi regime during the Holocaust.

Composition and toxic mechanism

In its marketed form Zyklon B released hydrogen cyanide gas when exposed to air and warmth. Hydrogen cyanide is a rapidly acting systemic poison: the cyanide ion interferes with cellular respiration by inhibiting the mitochondrial enzyme cytochrome c oxidase (complex IV), preventing cells from using oxygen to produce ATP and causing rapid organ failure at high doses.

Commercial uses and product form

Originally formulated for delousing, fumigating ships, warehouses, and stored goods, the product was handled as an industrial fumigant. It typically used an inert adsorbent to hold liquid HCN and allow controlled release. Trained personnel applied it under regulated conditions to eliminate insects and vermin.

Misuse during the Holocaust

During World War II, Zyklon B was used by Nazi authorities in extermination and concentration camps, where it was deployed to kill large numbers of people as part of the Holocaust. These actions were distinct from the product's intended pest-control applications and constitute crimes against humanity documented by postwar investigations and scholarship.

Aftermath, investigation, and legacy

After the war, the use of Zyklon B in mass murder became a central element of historical and legal examinations of the Holocaust. Evidence from camp records, survivor testimony, company documentation, and forensic analysis has been part of the historical record and of trials addressing responsibility for these crimes. The chemical itself remains a subject of study in toxicology and forensic science.

Notable distinctions and facts

  • Zyklon B was a fumigant product and not a unique chemical; its active ingredient was hydrogen cyanide (HCN).
  • In pest-control contexts it was used to control lice and insects; its lethal potential for people was the cause of its misuse.
  • Discussion of Zyklon B is often part of broader historical study of the Holocaust, industrial involvement, and the ethics of scientific and commercial activities in wartime.

Further reading and sources