It was not really called "Bayer" at that time, it was called "I.G. Farben"
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Zyklon B is a pesticide. Once exposed to air, Zyklon B releases cyanide; which kills people.
Hydrogen cyanide or Zyklon B as it was called.
Hydrogen cyanide.
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
Zyklon B is/was supplied in solid form but releases toxic hydrocyanic gas at above 25.5 degrees C (= 78F). If dropped into a sealed room with human beings tightly packed together it soon releases the gas.