Zyklon B Canisters, Auschwitz I, Poland. Originally used as an insecticide. When exposed to air, the Zyklon B pellets produced gaseous hydrogen cyanide that would attack the respiratory system causing death within 15 minutes. Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website This site uses Akismet to reduce spam. Learn how your comment data is processed.