That may be so, but what you're seeing is not the actual color. What you're seeing is shadows and highlights. When light hits the mid tone, which is the solid knox color you see, it brings up it's brightness, giving it a washed out pink color.
Here is the standard knox color with added highlights:
It's over contrasted so you can see what i mean, but that's basically how it works with the highlights in toribash.
Also, updated with Tyrian.