Pyridoxamine dihydrochloride Chemical Properties Melting point 224-226 °C (dec.)(lit.) density 1.4025 (rough estimate) refractive index 1.6100 (estimate) storage temp. −20°C pka pKa 3.31(H2O t = 25 I = 0.1)(Approximate) form Powder or Solid color White to off-white to pale brown Water Solubility Soluble in DMSO, water, or methanol /n