in the reaction chamber 1 the filter 4 is preferably of 0 01 to 5 microns in size samples of the pigment dye and cement powders are put on the center portion of the mesh 5 and are disposed within the reaction chamber 1 together with the supplying gas so that the samples may disperse within when a painted surface is treated with the plasma a sample is put on the center portion of the mesh 5 and is treated in the same manner as that of treating the pigment dye and cement powders structure of the grounded electrode and the high voltage applying electrode 8 will now be explained by referring to fig2 fig2 is an explanatory view showing the structures of the grounded electrode 7 and the high voltage applying electrode 8 used in the reaction chamber 1 in fig2 the grounded electrode 7 and the high voltage applying electrode 8 are formed by covering metal electrodes with a dielectric coating material 18 the dielectric coating material 18 may be of glass ceramics plastics or the like next an operation of the plasma discharge in the reaction chamber 1 will be explained since the gasses to be introduced into the reaction chamber 1 are important elements to stabilize the glow discharge under the atmospheric pressure the gasses will be explained in detail.