A literature review on various analyses referring to the Marangoni effect is given. The stability behaviour during mass transfer has been analyzed in the toluene/acetone/water system by holographic inferometry at a flat moving and quiescent phase boundary. Concentration differences between the bulk phases were varied and the influence of the direction of mass transfer and of the density profile in the mass exchanging phases have been considered. The experiments show the development of strong eddies in the area of the phase boundary as a result of growing concentration differences, with equilibrium being attained more rapidly. A limiting influence of diffusive transport in the bulk phases was observed.