Keywords: FDA History - Column Chromatography.jpg en An FDA chemist in the mid-1950s is shown using a column chromatographic apparatus to separate the constituents in a coal tar color analysis 2010-08-16 https //www flickr com/photos/fdaphotos/4899254776/ The U S Food and Drug Administration other versions PD-USGov Uploaded with UploadWizard Column chromatography |