Zyklon B is (or was) a trademark for hydrocyanic acid, or prussic acid, which is Blausäure in German, hence the B.
It was used as a poison gas in some Nazi extermination camps, mainly Auschwitz and Majdanek.
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Zyklon B is a pesticide. Once exposed to air, Zyklon B releases cyanide; which kills people.
Hydrogen cyanide.
Hydrogen cyanide or Zyklon B as it was called.
It was not really called "Bayer" at that time, it was called "I.G. Farben"
Zyklon B was developed by Fritz Haber, a German Jewish chemist and Nobel laureate. It was a cyanide based insecticide and used during the first world war for delousing, but was later used in the killing of thousands of Jews in gas chambers