All I know is that mine went from being pretty clear to pretty yellow since I started adding salt to my water, thus being less thirsty, thus having to pee less often. I was peeing an INSANE amount before.
Ha ha, I remember the last time that I went to planned parenthood and gave them a sample of my urine a couple of years ago (before AF). They put it next to all the other's. Mine was the only one that was glowing florescent yellow. Everyone else's was dark yellow. I always thought it was because those people were dehydrated, but maybe I was the sicko after all.