Byron,

Just talking about purple colors in flies, yes, they are very effective as you know. The Purple Haze is a great dry fly and very productive at times on the rivers of eastern WA and western MT. Purple San Juan Worms can also be very effective as are purple Woolly Buggers and Leaches. For the dry flies, the purple remains purple on the surface, but for the wet flies, depending upon the color of the water, after about 4 feet in depth the purple can actually turn to red.

Just my observations.

Larry ---sagefisher---