Appearance:Dark red brown or almost black powder
Properties:Soluble in water, ethanol and acetone, insoluble in ether and chloroform.
Uses:Titration with silver iodide and thiocyanate. Redox indicator (also a prototype red, oxidized lemon yellow). Adsorption indicator. Acid-base indicator, pH3.5 (red) to 5.5 (yellow).
Storage:Sealed in a cool dry place.