Non-fading and non-toxic Images printed with structural colour ink can be made both highly transparent to transmitted light (top) and at the same time reflect light from above in vivid colours (bottom) – two properties that are typically considered mutually exclusive. (Courtesy: H Yamana et al. Advanced Materials 10.1002/adma.202523036 2026)" title="Click to open image in popup" href="https://physicsworld.com/wp-content/uploads/2026/04/1-05-26-sugimoto-inkjet-display.jpg"> Non-fading and non-toxic Images printed with structural colour ink can be made both highly transparent to transmitted light (top) and at the same time reflect light from above in vivid colours (bottom) – two properties that are typically considered mutually exclusive. (Courtesy: H Yamana et al. Advanced Materials 10.1002/adma.202523036 2026) The majority of printing processes today are performed using different coloured pigments.…