Abstract: The security element comprises a background (1) with juxtaposed geometrical elements (2 to 8) each formed by a set of lines, the lines of a geometrical element having a different angle to those of an adjacent element. The lines of a part of the geometric elements are printed with a conventional ink and the lines of other parts of the geometrical elements are printed with an ink having metallic characteristics.

Abstract: The method comprises the following steps: printing of a background on the substrate, semi-transparent printing of a motif with optically variable ink, said motif at least partially covering said background

Abstract: The drawing has a background (10) composed of at least a first region and a second region juxtaposed. Each of said regions comprises its own geometrical drawing so that the first region has a color density which is stronger than that of the second region, said second region forming a pattern. An overprint (20) corresponding to said overprint is printed over the second region, said overprint (20) comprising geometrical drawings different than that of said second region and in a color chosen to compensate the difference of color density between said regions, so that the safety drawing appears uniform and with no pattern to the naked eye, but said pattern is clearly brought out and in another color than that of the first region on a photocopy of the safety drawing.

Abstract: The relief printing part (2) of the printing plate, which is intended to be inked over its entire surface, includes at least one etched recessed pattern (4) intended to be filled with the same ink as that serving for the inking of the relief printing part. The relief printing part preferably has a grainy structure composed of evenly distributed screen dots.