Around the world, a huge amount of research and development work is currently being done on carbon-containing, or organic, molecules that emit colored light after appropriate excitation. This research field is driven by the display industry and the development of biomedical imaging techniques. While precise color tuning in organic fluorescent dyes has so far usually been achieved by mixing different molecules, ETH researchers have now developed an approach that can generate a broad palette of colors by way of chemical adjustments within the molecules themselves.