Bazzer69 wrote: ↑Tue Apr 02, 2019 8:59 pm
The dramatic color change is in unwaxed thread. Once silk is well waxed it seldom changes color when in water. It’s common in Salmon flies to use a white underbody so the over wrapped colors appear more brilliant when wet. It’s always a good idea to test a new pattern under water to see if it’s the color that you expected.
B
Bazzer,
I've long thought that waxing silk thread slows but does not eliminate the darkening when wet. I'm unsure when or how I learned that supposed principle, so I did a few tests of whether well waxed silk does or does not darken when wet. The results, shown in two photos below, are in between those two extremes. Waxed thread darkens, although not quite as much as unwaxed thread.
I wrapped two layers of unwaxed Gossamer No.6B (Sherry Spinner) on a hook. I then pulled a second length of thread six times through a block of light-colored medium-hard tyers' wax (formula 7-2-1) and wrapped it on the same hook. This is the dry photo:
The silk darkened somewhat from waxing. The major effect though was removal of the silk thread's sheen. The unwaxed thread had a nicely reflective sheen (shiny surface), while the waxed thread had a "matte" finish of similar but slightly darker color.
I next tossed the hook in a tub of water. The unwaxed thread immediately darkened to its final color. The waxed thread darkened slowly to a final color that was considerably darker than when dry but a little lighter than the final color of unwaxed thread. This photo was taken after 6 or 7 minutes in the water:
The conclusions? (1) Both waxed and unwaxed silks darken when wet, but waxed thread darkens a little less (at least, with my wax and Gossamer No.6B). (2) Gossamer No.6B is beautiful when wet!
I should say that, of all the things that make for successful trout fishing, color is way down on the list of things that I think are important. Presentation and size, for example, are much more important in my opinion. If, however, a tyer desires a specific final color, flies tied with silk need to be checked when wet.
Cheers,
Phil