Which wavelength is the most desaturated for monochromatic light in a normal trichromat?

In the context of color perception for a normal trichromat, saturation refers to the intensity of the color or how pure the color appears. The most desaturated color corresponds to wavelengths where the color perception shifts towards a neutral gray.

Around the region of 492 nm and 498 nm, the perceived colors approach the boundaries of blue-green, where they are not as saturated. However, wavelengths that fall lower into the green spectrum, specifically around 545 nm, generally yield a more intense and saturated hue.

At around 570 nm, which aligns with yellow-green wavelengths, the color is still perceived as bright but it is typically less pure in terms of saturation when combined with the influences of the surrounding colors. This suggests that while 570 nm offers a clear hue, it tends to be less desaturated compared to the other options.

Thus, within the context of trichromatic vision, one can deduce that wavelengths like 492 nm and 498 nm are likely to represent colors that are less saturated compared to the yellower tones that begin to emerge at wavelengths like 570 nm. The peak desaturation when looking at the range of monochromatic light in trichromatic perception is most likely found around the green spectrum, making the wavelengths around