This method involves both dispersion and condensation processes. In this method, an electric arc is produced inside water (solvent) between the two electrodes of the metal to be dispersed. The heat of the arc evaporates the metal. These vapours of the metal are condensed by the ice cold water to form a colloidal solution. A small amount of KOH is added in the dispersion medium to stabilize the sol. This method is used for preparThg hydrosols of metals. Such as Ag, Au. Cu and Pt.