General view of laboratory technician Margaret Kreiser using assorted Perkin-Elmer atomic absorption instruments at a Hershey Company facility to determine the metal constituents of finished food items and raw materials. Per notations accompanying the photograph, chocolate typically contains 12 metals in trace amounts.
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Perkin-Elmer Corporation. “Perkin-Elmer Instruments in Use at Hershey Company Facility,” 1970–1979. Photographs from the Perkin-Elmer-Applera Collection, Box 4. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/8k71nj236.
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