Abstract: The various particles are one component of printing ink. They are hardly to be solved in solvents. In the present work these particles are selected: calcium carbonate, titanium dioxide, aluminum oxide and, they are formed suspensions when well dispersed in the solvents as ethanol, isopropanol, butanol. The conductivities of the suspensions are measured as a function of the concentration of the particles. The results show that the conductivities of the dispersed systems descend gradually when the concentrations of the particles increase. This is because of the increasing of the distances and the decreasing of the areas when the electric currents pass through the solutions filled with the particles. It is easy to determine the concentrations of the particles from the above results. And it is the first time to establish a criterion for determining such a dispersed system is or not homogeneous. It is homogeneous in case the conductivities measured everywhere in the solution are almost equal and vice versa.