Disclosed embodiments may relate to a time-dependent color-changing label for a product. The label may include a first layer comprising a plurality of particles, the particles comprising a time dependent color-changing material that changes color after a predetermined time period, the predetermined time period being greater than one month. The label may also include an attachment structure attaching the first layer to the product. In certain embodiments, the first layer may include a polymer, and the particles may include glass microspheres containing the time-dependent color changing material. The particles may be embedded in the polymer.

Disclosed embodiments may relate to a time-dependent color-changing label for a product. The label may include a first layer comprising a plurality of particles, the particles comprising a time dependent color-changing material that changes color after a predetermined time period, the predetermined time period being greater than one month. The label may also include an attachment structure attaching the first layer to the product. In certain embodiments, the first layer may include a polymer, and the particles may include glass microspheres containing the time-dependent color changing material. The particles may be embedded in the polymer.

The present disclosure relates to an encoding method and a decoding method using a chiral metal nanostructure. The encoding method according to an aspect of the present disclosure includes preparing a plurality of metal nanostructures having a chiral structure; obtaining the optical data of the plurality of metal nanostructures, and preparing a security medium including the plurality of metal.

The present disclosure relates to an encoding method and a decoding method using a chiral metal nanostructure. The encoding method according to an aspect of the present disclosure includes preparing a plurality of metal nanostructures having a chiral structure; obtaining the optical data of the plurality of metal nanostructures, and preparing a security medium including the plurality of metal.

A polarizer film is formed to include sets of polarized lines (sets of parallel lines) oriented at several directions across the surface of the film. The lines may be created using a printing process that transfers grooves from a printing plate to the film (e.g., an embossing process). A rotogravure printing process (or other suitable process) is then used to apply a liquid polarizing dye material to the printed film. The dye molecules align along all of the various grooves embossed in the film, forming a multi-axis polarizer film. The film may be used to form separate multi-axis polarizer labels (useful in anti-counterfeiting applications), and a process of easily removing the individual labels from the original film is described.

A polarizer film is formed to include sets of polarized lines (sets of parallel lines) oriented at several directions across the surface of the film. The lines may be created using a printing process that transfers grooves from a printing plate to the film (e.g., an embossing process). A rotogravure printing process (or other suitable process) is then used to apply a liquid polarizing dye material to the printed film. The dye molecules align along all of the various grooves embossed in the film, forming a multi-axis polarizer film. The film may be used to form separate multi-axis polarizer labels (useful in anti-counterfeiting applications), and a process of easily removing the individual labels from the original film is described.

An optical marking device including at least a first layer and a second layer disposed at least partially opposite each other, at least one of the first and second layers having an optically variable element being able to change colour between a first colour and a second colour, the first and second colours contrasting from a colour of the other layer in such a way that when the optically variable element displays the first colour, the first layer is visible and when the optically variable element displays the second colour, the second colour is visible, or when the optically variable element displays the first colour, the second layer is visible and when the optically variable element displays the second colour, the first layer is visible.

An optical marking device including at least a first layer and a second layer disposed at least partially opposite each other, at least one of the first and second layers having an optically variable element being able to change colour between a first colour and a second colour, the first and second colours contrasting from a colour of the other layer in such a way that when the optically variable element displays the first colour, the first layer is visible and when the optically variable element displays the second colour, the second colour is visible, or when the optically variable element displays the first colour, the second layer is visible and when the optically variable element displays the second colour, the first layer is visible.

A reflective security element for checking the authenticity with polarized light, has a retroreflective layer and a birefringent layer arranged in a structured manner on the retroreflective layer.

A reflective security element for checking the authenticity with polarized light, has a retroreflective layer and a birefringent layer arranged in a structured manner on the retroreflective layer.