Two years ago i would have fought in the street trying to convince you it did make a difference.
This season my best "big fish" catcher was a sparse parachute fly with an orange post.
Everyone on here kept harping on saying it did not make a difference and of course i disagreed

One evening i was sitting watching as you do, fish were in a scum line hovering up what appeared to be duns. I had no idea where my white posted fly was and i have eagle eyes. In frustration i put on the orange posted one, hay presto. That style of fly was not off my leader for just over a month and accounted for some stunning fish.
Na they dont work