The black wheel liner in the Mercedes Benz is of course all one color when clean…
Note how much shift the black wheel well liner color from this modern Mercedes car, shifts due to dust and maybe a little brake cleaner having been sprayed. It’s black, dark gray, “Panzer Gray”, gray, light gray, light blue gray etc.
So what’s the “right” color for the wheel well liner? Obviously, the actual base color and the color it “appears” are quite different.