We demonstrate for the multi-ink printers investigated that there are many spectral reflectances that can be produced approximately by a single printer through a large variety of different ink combinations. This
Mitchell R. Rosen, Edward F. Hattenberger, Noboru Ohta, "Spectral Redundancy in a Six-Ink Ink Jet Printer" in Journal of Imaging Science and Technology, 2004, pp 194 - 202, https://doi.org/10.2352/J.ImagingSci.Technol.2004.48.3.art00003