A printer includes an image forming unit to form a toner image on an image receptor by using a toner containing fluorescent additives for generating light in a predefined wavelength band in response to light in an invisible wavelength band, transfer the toner image to a print medium, and fix the toner image on the print medium, a photodetector including a light emitting unit configured to irradiate light in an invisible wavelength band to the toner image accommodated in one of the image receptor and the print medium, and a light receiving unit to detect reflected light from the toner image, and a controller to control a printing operation of the image forming unit, based on a detection signal from the light receiving unit.

A method and system for writing a label (defined within a predetermined region of the sample 110), the label displaying a visible layout of light-modified regions in a predetermined spatial arrangement. The method comprises: modifying regions of a material within the label using light, wherein the modifying comprises using light of a first polarisation state to provide photo-induced optically active regions of a first type having a first optical activity state which is characteristic of having been formed by light of the first polarisation state, in order to encode covert information in the label using the locations of the first type of light-modified regions within the spatial arrangement of the label.

A method of manufacturing a part with an anti-counterfeit feature is provided. The method includes providing a part to be marked for anti-counterfeiting. The part is provided with a radiation impacting feature on or within the part. The radiation impacting feature is configured to at least one of (i) prevent accurate imaging of at least a portion of the part and (ii) provide unique authentication of the part.

A label (1) of this invention includes an optical function layer (13) configured to pass light of a certain wavelength, a light absorption layer (15) facing the optical function layer (13) and configured to absorb the light of the wavelength, and a light scattering layer (12) intervening between the optical function layer (13) and the light absorption layer (15) and including hollow bodies configured to scatter the light of the wavelength. The light scattering layer (12) is configured to raise a transmittance at the wavelength upon receiving external heat.

A label (1) of this invention includes an optical function layer (13) configured to pass light of a certain wavelength, a light absorption layer (15) facing the optical function layer (13) and configured to absorb the light of the wavelength, and a light scattering layer (12) intervening between the optical function layer (13) and the light absorption layer (15) and including hollow bodies configured to scatter the light of the wavelength. The light scattering layer (12) is configured to raise a transmittance at the wavelength upon receiving external heat.

The present application relates to an anti-counterfeiting object including a face with an optical identification marking which is readable by the eye and/or by a machine, and an authentication volume, the authentication volume extending from the face in the thickness (z) direction so as to be accessible from the face in order to be read by X-ray diffractometry (XRD). The authentication volume is a composite of a first material, referred to as the authentication material, and at least one second material, the authentication volume constituting a material volume of at least 5 mm.sup.3. The authentication material includes at least one amorphous phase, at least one crystalline phase and at least one complex metal phase. The second material is typically a polymer. The application may advantageously be implemented by 3D printing.

A display member according to this invention includes a plurality of pixels. At least one of the plurality of pixels includes a relief structure formation layer including a first region configured to display a predetermined color on a condition, and a second region different from the first region, a first layer made of a first material, and covering at least the first region, and a second layer made of a second material different from the first material, and covering the first layer. The display member displays an image based on a distribution of the first region on the condition that the display member is observed in the oblique direction, and displays an image based on a distribution of the second region on a condition that the display member is observed with transmitted light.

A security mark is produced on a micro-porous, synthetic paper, structure by changing light transmission properties of light pathways through the structure. The security mark is visible when the structure is illuminated.

A security mark is produced on a micro-porous, synthetic paper, structure by changing light transmission properties of light pathways through the structure. The security mark is visible when the structure is illuminated.

The invention relates to a transfer film (1), in particular hot-stamping film, the use of a transfer film (1), a film, a security document (2), and a method for producing a transfer film (1). Here, it is provided that the transfer film (1) comprises a transfer layer (20) detachably arranged on a carrier layer (10). The transfer layer (20) further has at least one first color layer (30) and the at least one first color layer (30) comprises at least one binder and at least first pigments, the color appearance of which changes depending on the observation angle.