A process for bringing into contact, without mixing, a first material, consisting of a metal or of an alloy of several metals, in the liquid state, and of a second material, consisting of a salt or a mixture of several salts, in the liquid state, said first material and said second material in the liquid state being immiscible, said first material being electrically conductive in the solid state and in the liquid state, and said second material being electrically conductive in the liquid state and possibly in the solid state, in which the following successive steps are carried out: a) the first material, in the solid state, is placed in at least one first container comprising a wall made of a refractory solid material, which is not electrically conductive, transparent to a magnetic field created by at least one inductor, and not reactive with regard to the first and the second materials, said wall comprising one or more through aperture(s) (13, 14); the first material in the liquid state being non-wetting with regard to the said solid material of the wall; b) the said first container is brought into contact with a volume of the second material in the solid state, placed in at least one second container made of a refractory solid material, transparent to a magnetic field created by at least one inductor, not electrically conductive, and not reactive with regard to the second material; c) the first and second containers are subjected to the action of an electromagnetic field created by at least one inductor, by means of which induced electrical currents are generated in the first material in the solid state, and cause the first material to melt; d) the first material in the liquid state starts to move under the action of Laplace forces; e) the second material in the solid state starts to melt under the effect of a heat flux originating from the first container by conduction and radiation; f) an ionic conductivity appears in the second material, allowing induced electrical currents to develop, which accelerate the melting of the second material; g) the second material in the liquid state starts to move under the action of Laplace forces; h) the first material in the liquid state being in contact with the second material in the liquid state at said apertures, the first material in the liquid state is left in contact with the second material in the liquid state for a sufficient duration for an exchange, transfer of material to occur between the first material in the liquid state and the second material in the liquid state; i) the first container is removed from the volume of the second material in the liquid state; j) the first container is cooled until the first material returns to the solid state, preferably steps b) to g) are accomplished in a primary vacuum of 10 -2 absolute mbar to 10 -1 absolute mbar and step h) is accomplished in an atmosphere of an inert gas such as argon. a) the first material, in the solid state, is placed in at least one first container comprising a wall made of a refractory solid material, which is not electrically conductive, transparent to a magnetic field created by at least one inductor, and not reactive with regard to the first and the second materials, said wall comprising one or more through aperture(s) (13, 14); the first material in the liquid state being non-wetting with regard to the said solid material of the wall; b) the said first container is brought into contact with a volume of the second material in the solid state, placed in at least one second container made of a refractory solid material, transparent to a magnetic field created by at least one inductor, not electrically conductive, and not reactive with regard to the second material; c) the first and second containers are subjected to the action of an electromagnetic field created by at least one inductor, by means of which induced electrical currents are generated in the first material in the solid state, and cause the first material to melt; d) the first material in the liquid state starts to move under the action of Laplace forces; e) the second material in the solid state starts to melt under the effect of a heat flux originating from the first container by conduction and radiation; f) an ionic conductivity appears in the second material, allowing induced electrical currents to develop, which accelerate the melting of the second material; g) the second material in the liquid state starts to move under the action of Laplace forces; h) the first material in the liquid state being in contact with the second material in the liquid state at said apertures, the first material in the liquid state is left in contact with the second material in the liquid state for a sufficient duration for an exchange, transfer of material to occur between the first material in the liquid state and the second material in the liquid state; i) the first container is removed from the volume of the second material in the liquid state; j) the first container is cooled until the first material returns to the solid state, preferably steps b) to g) are accomplished in a primary vacuum of 10 -2 absolute mbar to 10 -1 absolute mbar and step h) is accomplished in an atmosphere of an inert gas such as argon.