Unless it is a very noticeable difference in the light versus dark shade of a certain color I don t keep it. I have a friend who will change shades of the same color flake in the same color worm and swear it makes a difference. Well, I agree of course. However, when you learn to have confidence in what the fish like instead of what you like it will not only save you money but catch more fish. Simplicity is the key to color selection for me.
Most forage has consistent colors.
Most crayfish are brown for instance. At certain times of the year there may be more orange or blue in them. A little dippy dye on the jig or plastic replica to add the changed tone is much more efficient to me than having 10 different colors of the same bait. Black and blue seems to work anywhere and most of the time. It may simply be the contrast against the darker surroundings.