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The effect of a dc magnetic field (60-120 mT) on the electrical conductivities of ammonia solu tions containing the W(VI) and Re(VII) ions in the course of magnetic processing for 24-48 h is studied. Magnetic processing is found to increase the electrical conductivities of 7 M ammonium hydroxide solutions containing 1 g/L tungsten or rhenium by 52-58%. The electrical conductivities of the solutions in a magnetic field are shown to depend linearly on the solution temperature and the tungsten or rhenium ion concentration in a solution. High electrical conductivities are retained for a log time (up to 2000 h) after the end of the action of a magnetic field. These investigations are carried out to solve the electrochemical problems of processing of the metallic wastes of the production of tungsten and rhenium.