What is the cause of coloration in urine?

Lots of things: Color of urine can be a refelection of how concentrated the urine is, if there is any blood in the urine, or if you have ingested & are clearing through your kidneys something that adds color to the urine, such as Azo standard/ pyridium, (phenazopyridine) which is used to help patients with bladder infections and has an orange color. Other meds can do similar things and have different colors.