When light strikes an opaque object, that object's surface determines whether the light is fully reflected, fully diffused or both. Conversely, light that strikes a transparent object is partially transmitted and partially reflected, like sunshine on a car's windshield. Because of the pigment's miniature size, Kodak's nanopigments give its inks translucent (good) characteristics. In other words, the larger (bad), non-nano pigments -- like scattered leaves on a windshield -- block incoming light, and this shadowing reduces (dulls) the reflectance and refractance of color, in wavelengths, back to the observer.
Kodak says it has commercialized a set of pigmented inks with pigment particle sizes in the 10-20 nanometer range, which improves the color gamut of its cyan, magenta and yellow.
Other, non-Kodak studies also show that certain oxide-based nanopigments serve as photoprotective agents by either reflecting or scattering UV radiation. Thus, nanocolorants do offer higher color saturation and, if combined with light-dispersing nanopigments, improved UV fade resistance.