Not entirely on topic, but I would like to express that the actual perception of saturation can be increased by setting the "black point" of the viewer, whatever that means.

It is my impression that the same print, seen against a black background, appears to have more saturated colours than against a white background. By the same token, slides are projected in total darkness, and as soon as some light enters the projection room the perception of saturation (and contrast) decreases noticeably. I understand the real saturation and contrast - in scientific laboratory terms - of the images is the same, but the perception is different.

So if you have a series of prints that you are showing to somebody, or exhibiting, and for one of these prints you would like to give a greater sense of saturated colours, you can show it against a dark(er) background. Or you could show it in the dark, lighted by a spot light.

I also suppose that the same applies to slides seen through the loupe on a light table. Our brain tends to set the darker zones as "pure black" and the lighter as "pure white" and we have a perception of high contrast which, I suppose, in turn tends to give a perception of high saturation. If we see some pure white (part of the light table without a slide over it) near the slide both the perception of saturation and of contrast tends to be lowered (although if we measure them they are the same).

Unless that's just the result of my hallucinations.