Gosh, guys, thanks for all the kind remarks. I like this fly overall as well for the tones and body texture against that cool hackle. The partridge Carl sent is just beautiful and should make for a number of nice patterns in this darker range. I really appreciate it and promise to make good use of it.
Splymph occured to me too...and then I let it go.
Ruard, we have a couple early season mayflies that really do have a deep burgandy/brownish body with dark dun wings in the Eastern U.S. This is not an imitation to the extent that it could be, I don't usually play matchy match to that degree, but it would make a nice, realistic looking food item in the right tone and with the right action under the right conditions. I honestly don't know off the top of my head the fly originally imitated by the Iron Blue Dun in the UK. Shouldn't be too hard to find it.
I'd be curious to see a list and color chart for the naturals living in your local streams. That's something I don't think I've ever seen.
Thanks again.
w