Similar to coin reactive inks, these inks are used to produce a transparent or white image on a substrate. Marking the printed area with a special felt tip pen can reveal this image. Pen reactive ink cannot be copied and is an easy way to verify a document’s authenticity. Application of the pen permanently marks…
These are pigmented inks which emit light when exposed to a light source of appropriate wavelength. The reactive glow decays or fades over time after the light source is removed, varying from seconds to hours.
These are colored or colorless inks that exhibit a visible, reversible color change when exposed to UV or bright white light source. When the light source is removed, the color gradually reverts to its original state over time. Because of its unique properties these cannot be reproduced by a scanner or copier.
These are colored or colorless inks that exhibit a visible, reversible color change or absence of color, in this case when exposed to heat, e.g. rubbing the surface or placing the substrate near a heat source. Once the source of heat is removed, the color gradually reverts to its original state. Because of its unique…
Visible or invisible inks containing pigments or dyes that appear when excited by exposure to a specific wavelength of light (like UV or IR) which then re-emit a new wavelength, usually in the visible range. Some UV inks are tailored to respond at specific wavelengths. UVA = 365nm (long wave) UVB = 315nm (medium wave)…
A discrete area on a document containing a defined shape whose primary optical activity is color shift depending on the viewing angle (quadrants below represent different viewing angles).
Combination of opacity and transparency on the same surface. The originally fully metallized image is selectively de-metallized to reveal specific texts or other sub-structures. The typical tolerances achieved during de-metallization are <0.5mm.
A DOVID that contains two or more interrelated visual aspects, such as de-metalized and transparent. A combined de-metallized and transparent DOVID revealing continuous authentication effects. The combination of both metallized and high-refractive index coatings in one device is more complex and more difficult to counterfeit.
An opaque DOVID which exhibits a fully metallized (aluminum) diffractive image with optically variable effects. Utilized on both paper substrates and polycarbonate.
A precision metallized DOVID is comprised of fine-line diffractive images which are in precise register to the metallization. In contrast to conventional de-metallization, the tolerances approach zero. Designs include Guilloche patterns with clearly-defined moving patterns and fully transparent intermediate areas (i.e. with no diffractive structures) revealing the underlying document security print. The registration between the…
