. Whatever they did, it worked. According to this article is was merely exposure to air that caused the pellets to gas off. The pellets were sealed in cans.
What Was Zyklon B? Zyklon B was an insecticide used in Germany before and during World War II to disinfect ships, barracks, clothing, warehouses, factories, granaries, and more.
It was produced in crystal form, creating amethyst-blue pellets. Since these Zyklon B pellets turned into a highly poisonous gas (hydrocyanic or prussic acid) when exposed to air, they were stored and transported in hermetically sealed metal canisters.
Gotta remember too that the Germans had A LOT of experience with HCN from WW1.
