Chromatography Blotting Paper - 2388-1834 - Grade 238, 18cm x 34cmAhlstrom Munksj Grade 238 0. 34 mm 140 mm 30 min This medium thick paper is recommended for general chromatography applications. Grade 238 is also ideal for use as wicks in protein or nucleic acid blotting to provide a uniform flow of buffer through the gel to the transfer membrane of a blotting sandwich. This is our most widely used blotting paper. Grade 238 is also suited for electrophoresis and the separation of inorganic compounds and for use in