Potassium dichromate extra pure (99.5%) is a high-purity, bright orange-red crystalline inorganic salt containing hexavalent chromium (Cr⁶⁺). It is a strong oxidizing agent widely used in analytical chemistry, volumetric analysis, reagent preparation, calibration standards, electroplating, corrosion testing, pigments, and research applications where higher purity and consistent performance are required.