Heading to the Don soon so if i meet someone fishing in a 'Gimp' mask i'll have a fair idea who it is.
Back to the flees. Try either an underbody of black thread and then the tinsel over with the body dubbed very sparse over this (final rib of black thread). This lets the colour 'bleed' through but protects from troot teeth damage too quickly.
Or tie as my Bibio Emerger body: (sparse)
Black seal / rabbit / green glister (choped fine) mix front and rear thirds with scarlet seals fur middle ribbed with black tying thread. This gives the flash required via the glister (green better than pearl by the way) as well as offering a robust tying. Two, sometimes ever three fish
Nah to be honest i wouldn't know as i tend to stick mine in the trees or bushes long before any troot are interested.
BTW the rest o the Bibio Emerger is:
Head Two turns white cock trimmed below (no jokes please
)
Hook size 12 to 16 B400 (or fine wire barbless equiv).
Try it as well without the red bit (Simply called the Black and White) or with claret instead of red (Claret bibio). Was up all night thinking the name for that one.