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.

The disclosure provides a screen protector that not only protects screens but also includes at least one image having levels of visibility according to different lighting conditions. Visibility of the image can also be based on a privacy filter. The privacy filter can be part of the screen protector. In one example, a privacy screen protector for a screen is disclosed that includes: (1) a substrate having an image, and (2) a privacy filter having a viewing angle that prevents viewing of content displayed on the screen that is not within the viewing angle and simultaneously allows viewing of the image at viewing angles that is not at or within the designated viewing angle, wherein viewing of the content is further based on activation of the screen.

Provided is a data carrier for a secure article such as a passport comprises a carrier body and at least one security element being provided on the carrier body. The security element comprises at least one surface structure extending along at least one extension direction (E) and at least one print being at least partially arranged on the surface structure. The security element, in the region of the surface structure, is configured to exhibit different appearances when being observed under different viewing angles. Other embodiments are disclosed.

A security device is provided, comprising one or more surface relief structure(s), each formed of one or more cured material(s), the surface relief structure(s) being disposed on a substantially flat substrate and defining a plurality of raised elements spaced from one another, the raised elements corresponding to elements of an image, whereby the plurality of raised elements varies across the surface relief structure(s) so as to exhibit a multi-tonal version of the image. Methods of manufacturing such devices are also disclosed.

A security article may include a substrate. The security article may include a layer of security ink. The layer of security ink may include a set of color-shifting interference particles. The security article may include a layer of magnetic color-shifting ink. The layer of magnetic color-shifting ink may include a set of magnetically aligned magnetic particles. A color-shifting property of the layer of security ink and a color-shifting property of the layer of magnetic color-shifting ink may have a threshold level of similarity to create a color matching effect.

An asymmetric pigment including a first Fabry-Perot structure; and a second Fabry-Perot structure; wherein the first Fabry-Perot structure and the second Fabry-Perot structure have a similar hue angle within +/45 degrees is disclosed. Other asymmetric pigments are also disclosed as well as methods of making the disclosed pigments.

A security device is provided, including: a surface relief structure formed of one or more cured materials on a substantially flat substrate, the surface relief structure defining a primary set of relief elements at a first scale and a secondary set of relief elements at a second scale which is smaller than the first, the primary set of relief elements including a plurality of raised protrusions spaced by recesses and the secondary set of relief elements being disposed on the tops of at least one of the raised protrusions and/or in at least one of the recesses. A security device including a structure formed of cured material(s) and an embossed structure is also provided. Methods of manufacture are also disclosed.

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.