Examples are directed toward anticounterfeit markings printed on a substrate. The substrate has a front side and a back side and is printed with front side markings on the front side and back side markings on the back side. The front side markings and the back side markings have dimensions in a micrometer range. The front side when viewed with reflected light comprises first portions of a plurality of characters. The back side when viewed with reflected light comprises second portions of the plurality of characters. The first portions and the second portions are printed, when viewed with transmitted light, to show the plurality of characters as whole characters having dimensions in the micrometer range, as a transmitted light security feature.

A substrate is printed with front side and back side markings. The front side when viewed with reflected light includes a first marking printed with a first gradient of a first color with increasing intensity from a first edge of the substrate to a second edge of the substrate. The back side when viewed with reflected light includes a second marking printed with a second gradient of the first color with decreasing intensity from the first edge of the substrate to the second edge of the substrate. The first gradient and the second gradient are selected for a combination of the first marking and the second marking, when viewed from the front side with transmitted light, to be seen with a same intensity of the first color at the first edge and the second edge.

A method of achieving precision registration in a roll to roll process by simultaneously depositing multiple inks onto a printing roll. One of these inks prints a pattern of fiducial marks onto a substrate while another ink prints a predetermined pattern on the same substrate such that the predetermined pattern bears a predictable spatial relationship to the pattern of fiducial marks. Consequently, even if the ink forming the predetermined pattern is invisible, or has such low contrast with the substrate that it is effectively invisible, or even has been dissolved away in a subsequent processing step, it is still possible to know where the predetermined pattern is by referring to the pattern of fiducial marks.

A substrate is printed with front side and back side markings in a first color ink. The front side when viewed with reflected light includes a first marking printed in a first saturation and a first symbol printed in the first saturation. The back side when viewed with reflected light includes: a second marking printed in a second saturation; a second symbol printed in the second saturation; a third marking printed in the first saturation; and a third symbol printed in the first saturation. The first marking, the second marking, and the third marking are printed to provide an interlocking pattern of low saturation color and high saturation color when viewed with transmitted light. The second symbol is visible, and the first symbol and the third symbol are visible and indistinguishable, when viewed with transmitted light.