/It is also possible to combine sodium cyanide with concentrated hydrochloric acid to create hydrogen cyanide gas that can be lethal in an enclosed space, and this method has been used in gas chambers over the years./

Garām, sērskābi vajag. Šitā būs HCl un HCN maisījums hvz kādās proporcijās, sērskābe nav gaistoša un ir stiprāka skābe.