the darker the color the more ketones are in your pee (the more fat being burned).... dont worry too much about the shade as long as its pink upwards.... nothing to do with dehydration.... the ammount of water that you drink on TFR is so high that the kidneys are constantly being flushhed through which keeps it mostly to a,light pink... (with some exceptions i guess) an example, if i went to the gym and done a heavy workout and then tested i would be dark purple, as by body has just used a load of extra fat cells for energy so a big release of ketones into the body.... if a normal non energetic day then will be a pale pink as just on a steady burn and constantly peeing and flushing due to the ammount of water im drinking.... hope that helps to understand a little.... basically dont worry about the shade.. pink i s perfect!....
oh and also (just incase you ever get this) example, if you drank a pint of water and then went pee, then drank another pint quickly and needed to pee again like within half hour, your pee may even come out negative, which you should not be alarmed about as its just you flushed your kidneys so quick the water didnt have chance to collect any ketones on the way through! LMAO!
basically, dont worry about it too much! hehe