DDT is a white crystalline substance made by reacting monochlorobenzene and chloral in the presence of sulphuric acid. Its amazing insect-killing power was dis-covered by chemists in the Swiss firm of J. R. Geigy in 1939. This firm had an established reputation for synthetic dyestuffs, but before the discovery of DDT was relatively unknown for insecticides. For about twenty years Geigy chemists had searched for a moth-proofing agent, which would be odourless, colourless, non-toxic to humans and resistant to deterioration by light. They finally marketed such a material under the name ‘Mitin FF’.
KeywordsDiesel Engine Nobel Prize Colorado Beetle Practical Instrument White Crystalline Substance
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