SteveJ, CrappieWorld magazine usually has several real good stories about color & crappie. I've got every issue from back many years ago, and went thumbing through them to find some of the articles regarding your post. I think you can call and get them to send you a certain issue from the archives, as I've done this before for one I've misplaced. Anyway, there's a good article in the Fall/2004 issue, and another in the Oct/Nov/Dec/2006 issue. One even elaborates on what the "experts" who've done underwater studies say about how far (in feet) a crappie can see in clear vs. stained vs. muddy water (compared to humans) ........pretty interesting stuff. I didn't go through all of them, but I'm sure theres more articles in some of the older issues. Hope this helps
If I Ain't Crappie Fishin', I'm Thinkin' About It............