Non-Rainbow OVD

During The High Security Printing Conference in Budapest we have presented our Novel Non-Rainbow OVDs Based on Diffraction Optics




Sub-wavelength structures are especially of interest. They produce optical effects that are not common for classical OVDs thus can be used as an effective visual security features:

  • pastel colors;
  • antireflection (black color);
  • zero-order color shift;
  • polarization contrast.

These first line inspection features are easily recognized by common people and are difficult to simulate for other widely used technology.