In addition to changing its smell, certain foods can also influence the color of urine. Beets can cause urine to be a reddish tint. Fava beans or rhubarb can cause urine to be dark brown or even black. Blackberries can turn it pink. On the other hand, a kidney stone could give it a brownish tint, and blood in the urine can be indicative of kidney damage. Liver damage can lead to brown urine as well.