Zyklon B

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A can of Zyklon B with adsorbent granules displayed at the Auschwitz museum.
Prussian blue.

Zyklon B was the trade name of a pesticide with hydrogen cyanide (prussic acid) as the active ingredient. It consisted of adsorbent granules with hydrogen cyanide in sealed canisters. Opening a canister slowly released hydrogen cyanide as a gas.

It was historically widely used in order to kill pests, such as lice in clothing and buildings. As lice may also spread diseases, such as typhus, especially when many people live closely together, such as in concentration camps, Zyklon B was an important agent against diseases. Today, hydrogen cyanide has in most cases been replaced by newer pesticides, but is still used, using other trade names.

"Prussian blue" is a dark blue pigment containing cyanide. It may form on surfaces after repeated Zyklon B exposure.

Zyklon B is most notorious for being the alleged mass murder method used in gas chambers in some of the Holocaust camps, including Auschwitz and Majdanek.

Holocaust revisionists argue that various properties of Zyklon B are incompatible with the descriptions of how the alleged mass killings occurred, that the constructions of the alleged homicidal gas chambers are incompatible with mass killings using Zyklon B, and that examinations of Zyklon B derivatives in gas chambers walls demonstrate that no mass murders occurred.

See the Holocaust material evidence article as well as the "External links" and the "See also" section in this article regarding details.

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