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Purity / Analysis Method: >98.0%(T (HPLC) Colour : Yellow powder. Physical State (20 deg.C): Solid Melting point : 114 °C Solubility in water : Insoluble Appearence : Yellow to orange brown powder. Transition range pH 2.9 to pH 4.0 : Red to yellow Absortion maxime in ethanol : 403-407 nm Appearance of solution : 0.1% solution in ethanol is clear