of the stripe 3c is selectively anodically oxidized to be changed to the transparent oxidized aluminum film which is immersed in acid bath containing the blue acid dye aluminum blue llw and therefore is colored blue after this the substrate is subjected to the porosity sealing treatment thus the color filter having red green and blue stripes is completed when the pattern of the multicolored plate or the multicolored filter such as those described in the above explained two embodiments is coarse the patterning process of the aluminum film or the double layer film of aluminum and the transparent conductive film may be replaced by another process as described below instead of the first and the second process in the embodiment 1 or the first the second and the third process in the embodiment 2 namely a metal mask having the same pattern as that formed on the surface of the substrate is closely set on the surface of the substrate then the substrate covered by the metal mask is subjected to a spattering process of aluminum or of indium tin oxide and aluminum so that the aluminum film or the double layer film of indium tin oxide and aluminum having the desired pattern is obtained without effecting the etching process as above explained.