What wavelength is recognized as least saturated in normal trichromats?

In the context of color perception among normal trichromats, the concept of saturation relates to the intensity or purity of color. The saturation of a color can vary depending on its wavelength.

The wavelength recognized as least saturated is typically around 570 nm, which corresponds to the yellow region of the visible spectrum. Colors in this range are often perceived as less intense, or less saturated, compared to hues at the extremes of the spectrum (for example, red and violet). This is due to the way the human visual system interprets light; our perception of brightness and color acuity tends to be lower in certain wavelength areas, and 570 nm comes across as a more desaturated, pastel-like yellow.

Conversely, other wavelengths such as those in the blue-green (around 492 nm) or reddish-orange (around 620 nm) regions often exhibit higher saturation levels. The 556 nm wavelength, which is closer to green, also carries more saturation than 570 nm. Thus, while all these wavelengths represent different colors, the perception of saturation is significantly influenced by the characteristics of light and its interaction with our visual system in the context of trichromatic color vision.