A pale yellow colour is normal in most instances. Bright yellow or fluroescent yellow can sometimes indicate a high level of toxins present in urine. Your urine is a byproduct of the fluids that enter your body which is partly obvious, but your urine has to be filtered through your kidneys which act to take out nutrients and toxins, working in parallel with your liver which is slightly more crucial to a human beings anatomy. In many circumstances strong dyes from foods may come out in urine such as the red dye in beetroot. When large amounts of water has been consumed it is commonplace for urine to become very clear. This can help to fight toxins in the body and doctors will often recommend drinking your body weight in ounces of water per day, to keep the body cleansed and replenished.
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Urine is normally about 95 per cent water. The balance is waste and it normally turns the urine yellow. The darker the yellow, the higher the concentration of waste. Dark urine may indicate a cold or infection.
Brown urine may indicate blood in the urine -- check with a medical professional.
There is also a condition called porphyria which causes the urine to appear blue. Some medications and illegal drugs -- but not all -- may also cause a temporary color change.