Bromophenol Blue CH019 — 25 g free acid powder. Electrophoresis tracking dye and pH indicator (yellow pH 4.6). Migrates at ~300 bp on 1% agarose. For agarose and SDS-PAGE loading buffers (0.25% in 6× agarose dye; 0.002–0.01% in Laemmli buffer). Store cool, dry, ventilated. Sodium salt form available as CH023 (100 g).