We propose a fast, green technology for creating colour images directly on metals and other materials using lasers. The unique surface modification is visually appealing with brilliant colours and hologram-like effects. The colours are created by nanoscale surface modification without using any pigments or dyes.

Created nanostructures can be used for the toughest anti-counterfeiting applications with an easy verification of authenticity of various objects. The technology is fast and can be used to create exterior artworks that will withstand the test of time in the tough environment.