GelRed is a sensitive, stable and environmentally safe fluorescent nucleic acid dyes designed to replace the highly toxic ethidium bromide (EtBr). 6X GelRed Prestain Loading Buffers are gel loading buffers containing density agents, tracking dyes, and GelRed dye. The 6X prestain loading buffer is added to samples in place of gel loading buffer, and eliminates the need to add fluorescent DNA dye to the agarose gel during casting. This prestain buffer contains contains an orange electrophoresis tracking dye that runs at approximately 50 bp in a 1% agarose gel. Properties: Liquid; Store at 4°C and protect from light.