Ray,
Yes on blue cast on the magpie barbs.
You can see it better on this fly, wing out of the same actual feather I used on the Sooty Magpie
Street Hooker
Hook: Tiemco 102Y #15
Thread: Benecchi 12/0, grey
Hackle: Grouse wing covert barbs
Tail: Hackle barbs, black
Body: Rabbit, black; UV Ice Dub, tan - mixed
Wing: Magpie wing secondary quill strip, doubled
Note: I noticed this magpie feather lying on the pavement, and it just called out to me to pick her up...
Cheers,
Hans W