on a cloudy day at altitude and distance almost all colors look black.most visible is whie.no matter what plane or size there are always visibility issues on certain days.i have a stafford p-39 done up in camuflage with a light blue underside.normally the tan and green upper body shows up quite well except the fall when the leaves change color.on more than one occassion i have lost the plane on final after it descends below the tree line and blends in,i have had to pull the nose up to be able to see the blue underbelly to find it.