cliparts/e/b/a/a/clipart-nmr-tube-ebaa.svg image/svg+xml Open Clip Art Library NMR tube 2011-09-22T08:01:15 NMR sample tube with red cap http://openclipart.org/detail/161659/nmr-tube-by-antares42 Antares42 NMR clip art clipart experiment glass nuclear magnetic resonance research science spectroscopy spectrum tube urine