I do agree that it would be very difficult or impossible to preform a scientific experiment that would determine why a bass hit or not hit a cetain lure. There are way to many variables to prove beyond any doubt that color had any effect. As said before my experience with bass is limited, so I don't have any examples of color being the deciding factor when it come to bass. As far as other species of game fish, I have many examples where I have had the good fortune to be able to catch fish on almost every cast in clear water where I could watch their reactions to my lure for many days in a row. I tried my best to limit variables, to the point that I am satisfied with the conclusion that color was the biggest factor in catching that species of fish in that spot on that day. Size, retrieve, and lure action, within reason, didn't seem to make a difference. Why they liked that color, I could only guess. ( If anyone wants to here details on these fishing experiences, and why I came to these conclusions, send me a personal message. I'm not going to post any more on this topic because I'm sure many people are getting tired of my posts.) Most of the time matching the color of the prey was my theory, but obviously it could have been some other reason. As far as why the originator of this post caught fish in clear water on dark baits, I would guess it was because the bass were used to eating dark baits. I wouldn't say bait is dark in clear water, and not in dark water. I have no clue to why some bait is dark while others are light. I only would guess the bass in this lake at this time were eating dark prey, therefore liked dark lures. It could be the dark lures were more visible, I couldn't say. Because bass do have eyes that can see color, it would only make sense to me, that they use this ability to find prey, determine what they can or can't eat, and ovoid predators. Obviously they use all of their senses for the same reasons. It also makes sense to me, which factor is more important would change due to changes in water conditions, type of prey, past experience, age , size of fish, and thousands of other factors. Many very experience fisherman on this site have never observed a time when they think color mattered to the fish. They are lucky, they can save lots of money.