Somethin to think about when body color is being considered. Gary LaFontaine gave scientific understanding to body color in this respect. Think of the color of the rainbow, the spectrum. Red, orange, yellow, green, blue, indigo, and violet. As you move from red at the beginning to violet on the end, the colors become more visible in low light conditions. In the medium of water with all the particulate in the water, on a sunny day, and in clear water with a minimum of particulate, red stands out well, but is the first to fade given shady, low lt. conditions, or in murky water. That is when the bass guy, as an example, does well using purple, rubber worms. So when you think of the classic "Royal" patterns, the Royal Coachman dries, and wets that have produced well over the years, you are covering your basis. Fish the Coachman in the darker, shaded area, and it is the peacock green that enhances the fly, and draws the strike. Now fish it in the more open, bright light area, and the red comes to life, and can draw the strike. It could just be that the yellow shows up when the grey has faded, and that is why the Female Adams worked well. Red has longer wave lengths, and purple the shortest, and the longer wave lengths get filtered out first.