The Dorset Biological Warfare Experiments were a series of experiments conducted between 1953 and 1975 to determine the extent to which a single ship or aircraft could dispense biological warfare agents over the United Kingdom. The tests were conducted by scientists from Porton Down, initially using zinc cadmium sulfide (ZnCdS) as a simulated agent. Early results showed that one aircraft flying along the coast while spraying its agent could contaminate a target over 100 miles (160 km) away, over an area of 10,000 square miles (26,000 km2). This method of biological warfare–and the test method used to study it–were known as Large Area Coverage (LAC).