hydrogen cyanide used as a poisonous gas, esp. in Nazi concentration camps
In the next case are photocopies of transit passes for the trucks that brought the cannisters of zyklon B pellets.
Finally the empty canisters of zyklon B, perhaps a hundred or more, in a pile.
zyklon B, a gas used by the Nazis in the death camps, is a haunting example of the rapid lethality of one form, hydrogen cyanide.