Pearlescent blue Krystal Flash / Flashabou Blue flashabou (body)
Red thread band Red thread (mid-body)
Calf tail White calf body hair (wing)
Brown hackle Brown hackle (1-2 feathers)
How to tie it
Start the red thread at the 75% mark, tie in an upright white calf-tail wing and post its base, then split or leave it as a single upright clump.
Wrap to the bend and tie in a short bunch of brown hackle fibers for a tail about one shank long.
Tie in several strands of pearl-blue Krystal Flash at the bend, wrap the thread forward, then wind the flash forward. Leave a gap at the middle and build a distinct red thread band there, then continue the flash to the wing.
Coat the flash body with a thin layer of head cement or UV resin for durability if desired.
Tie in one or two brown hackles behind the wing and wrap a few turns front and back of the wing for a full collar.
Whip finish at the eye and cement; the red-white-blue theme gives the fly its name.