Gem,
Good question and I have no answer to it. I make my own furled leaders and my standard furled leader is:
7 foot long
I usually make most of them out of either green or brown kevlar tying thread. Also make some out of green 4 pound test mono or flurocarbon.
I attach a 5 foot long tippet which is 4 pound test flurocarbon.
I fish nymphs and wet flies and green and brown furled leaders do not seem to bother the fish I fish for. Of course, there is 4 to 5 foot of flurocarbon between the furled leaders and the flies. I have fished very clear water and have not seen any problems as far as my style of fishing goes.
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Warren
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.