Abstract: A method for producing a finishing layer containing a window (104) for a portable data storage medium, in particular a chip card, and the use of the method for producing a data storage medium. A transparent plastic-based support layer (28) is used and an opaque color layer (30) is applied on the support layer in a screen printing process, wherein the color layer (30) has a recess (32) having the dimensions of the window (104). A first layer (40) of a transparent primer is then screen printed onto the color layer and a design color layer (50) is then applied in an offset printing process onto the first layer. A second layer (60) of a transparent primer is applied in an offset printing process on top of the design color layer (50) and a transparent finish (70) is finally applied onto the second layer (60).