6x Gel Loading Paint is a loading buffer mixed with two tracing dyes (Bromophenol blue and xylene cyanol) for use in DNA samples in (Blue) agarose and non-denatured polyacrylamide gel electrophoresis. It contains EDTA to chelate magnesium (up to 10mM) in the enzymatic reaction, so the reaction is stopped. Bromophenol blue and xylene cyanol are standard tracing paints for electrophoresis.