Well........ i would think that since it's dark water there would be a very small amount of light penatrating below the surface. I would think that motion (Chatters, rattles and spinners ) would attract the fish and down in the depths color would not matter. If it did then why not "Try" to use ANY available light with a bright color lure. Some light may hit the bright color and light it up better than a dark lure color. I never bought into the dark water = dark lure idea but I do go with motion or smell(live bait)