Not very! This is on the "line of purples". Here's a nice visualization of color perception (there are more modern ones, but we used the 1931 color space when

Not very! This is on the "line of purples". Here's a nice visualization of color perception (there are more modern ones, but we used the 1931 color space when I was working in the field). The horseshoe shape on the outside is the single wavelength colors. https://en.wikipedia.org/wiki/CIE_1931_color_space https://en.wikipedia.org/wiki/CIE_1931_color_space