I think that, if I remember, some experts years ago said that various colors lose their color as the light penetration decreases. I believe red is the first color to go, and blue maintains its color with the least light. They also said the colors change to a grey. Who knows what a bass sees, and how it affects it. Does color make a difference? It sure does. What color is the best? The color you have the most confidence in. As far as red line, a lot of fish were caught on gold Stren. Any of yall remember that stuff?