Caption: "A continuous liquid-liquid extractor in use for the extraction of steroid sex hormones from body fluids. The extracting fluid is benzene which is being continuously dispersed in a watery phase, thereby extracting and concentrating the sex hormones. In one operation the hormones may be concentrated from 2,000 to as high as 200,000 times. RF photo #21632.
Rockefeller Archive Center, Rockefeller Foundation records, photographs, series 200A, box 82, folder 769
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