Reproduced with permission

Early in the 20^th century a factory in the town of Pitsea in England manufactured the explosives using nitro-glycerine. 

Hydrogen Sulfide

Hydrogen Sulfide is a highly toxic chemical compound that is found in a wide variety of oil processing operations. High concentrations of H₂S may be present in crude oil, molten sulfur, tank and pit-bottom sludge and produced water, all of which may release H₂S when agitated, heated, or depressurized. Typical operational activities where personnel may be exposed to H₂S include drawing samples, handling and testing samples, gauging tanks, and when opening lines and equipment.