P 2136 (OTTO) Potassium bromide, ≥99.5% Cas 7758-02-3 - used in the preparation of stable Pd nanocubes used in immunolabeling. P 2136 (OTTO) Potassium bromide, ≥99.5% Cas 7758-02-3 - used for the purification of Sarcocystis neurona sporocysts by discontinuous density gradient centrifugation.