Post-production acids were recovered in this four-storey building. The building consists of two sections, a main section for the separation of sulphuric acid from nitric acid, and a side section for the concentration of nitric acid. The exhibition in this building deals with the history and development of the industry. These range from small arms (3rd floor where you are now) to firearms (2nd floor), ABC weapons of mass destruction (1st floor) to military vehicles, ships and aircraft (ground floor of the building).