An invisible ink management method and system. The method includes receiving by a computer processor data associated with an image to be duplicated and a duplication command enabling reproduction of the image. The computer processor receives a command for enabling a duplication prevention functionality and generates a first copy of the image. The computer processor enables an invisible ink spray nozzle. In response, the invisible ink spray nozzle sprays a plurality of invisible images on the first copy. The plurality of invisible images are invisible under first lighting conditions and are visible under second lighting conditions.