Digest the solid salt with dilute aqueous NH4NCS, filter, wash it thoroughly with H2O and dry it at 110o in the dark. It is soluble in dilute aqueous NH3. Alternatively dissolve it in strong aqueous NH4NCS solution, filter and dilute with large volumes of H2O when the Ag salt separates. The solid is washed with H2O by decantation until free from NCSions, collected, washed with H2O, EtOH and dried in an air oven at 120o. It has also been purified by dissolving in dilute aqueousNH3 when single crystals are formed by free evaporation of the solution in air. Store it in the dark. [Garrick & Wilson J Chem Soc 835 1932, Occleshaw J Chem Soc 2405 1932, IR and Raman: Acta Chem Scand 13 1607 1957, Lindqvist Acta Cryst 10 29 1957.]
