” ALL OTHER COLORS are reflections of light, except black. Black is the absence of light”.
I recently spent a few days fishing a large wide tailwater river. Most of the time the water’s surface was a silvery-grey due to glare. It looked like the element: Mercury. Many trout were feeding on tiny BWO emergers and bulging in the riffles. The wind was also constantly blowing which further ruffled the river’s surface. All of these conditions (glare, riffles, wind blown water) made seeing a small size 18 fly impossible, even when relatively short casts were made. Deer hair winged emerger patterns and comparaduns didn’t show-up. Same with a parachute pattern tied with a white post. Hackled flies also pulled a Houdini on me (vanished). Hi Vis orange post flies also couldn’t be seen. Hi Vis ended up being No Vis!
The secret to success on the insect rich river that I was on is to consistently place your fly right in front of a selected feeding trout as there are thousands of naturals (insects) drifting towards it and the fish isn’t going to move any distance to eat your fly. Your impression has to be right on target. It is all about accuracy. And in order to be on target you need to see your fly.
The only fly that showed up in the aforementioned challenging conditions was one with a black post or a black wing. And I found that the flies that I had tied with a very exaggerated, robust tuft of black obviously showed best in the silvery-grey, ruffled water.
Many of my favorite trout rivers are wide and flow in open terrain under a big western sky. These conditions give birth to glare which is a serious hinderance to seeing a small fly. One third of the flies in my boxes have black material incorporated onto them in the form of a post, a wing, etc. In the flies below (photo) I used black polypropylene. In some other flies I’ll use black cdc or comparadun deer hair which has been dyed black. The key is something dark; a dark beacon.
Sometimes you can see your fly better by changing your positioning to a fish on a river. However, this is not always possible. Some people fish a two fly rig with one fly being much larger than what is hatching. The large fly is used as a sight and strike indicator to help an angler spot or at least hone in on the approximate location of the small fly. Even large flies, however, tossed some distance on silvery-grey wide open water tend to disappear. Also two fly rigs in windy conditions often get tangled, at least mine do. I always prefer casting a single fly. I simply cast and fish better with one fly.
Trout that are feeding aggressively on a dense hatch don’t seem to notice the color of a post or wing. The size of the fly, its attitude/positioning in the water (on top, in the film, or dangling below) and a natural drift (presentation) are much more important, as is casting accuracy and being a stealthy angler. You want the body color of the fly to be somewhat similar to the naturals but the wing color is less important.
Black polypropylene is inexpensive and with one package you will be able to tie hundreds of flies.
Here are some small size 18 parachutes tied with a black post…