CHEMICAL HERITAGE FOUNDATION / SCIENCE PHOTO LIBRARY CHEMICAL HERITAGE FOUNDATION / SCIENCE PHOTO LIBRARY
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Charles B. Gnadinger (1889-1958), US chemist. Gnadinger worked on insecticides, particularly on the application of pyrethrin extracts from Pyrethrum flowers. Gnadinger worked for the USDA (United States Department of Agriculture) until leaving in 1919 to join the McLaughlin Gormley King (MGK) pest control company (he later became president of the company). In 1929, Gnadinger developed a process to extract pyrethrins, with the refining process improved in 1943. Gnadinger published his results in 'Pyrethrum Flowers' (1923). Photographed in around the 1920s by the Blank and Stoller photographic studio, New York, USA.
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