Simplify sample preparation for agarose gel electrophoreis and save time. Norgen's 6X Bromophenol Blue DNA Loading Dye is a concentrated premixed DNA sample loading buffer formulated with electrophoresis tracking dye. In a 1% agarose gel the Bromophenol Blue tracking dye is expected to run at approximately 300 bp. This DNA loading dye comes in a 6X concentration in a glycerol and Tris buffer. Simply dliute your sample to 1X and load onto the gel.