<Li> Black or dark - colored urine is referred to as melanuria and may be caused by a melanoma or non-melanin acute intermittent porphyria . </Li> <Li> Pinkish urine can result from the consumption of beets . </Li> <Li> Greenish urine can result from the consumption of asparagus or foods or beverages with green dyes . </Li> <Li> Reddish or brown urine may be caused by porphyria (not to be confused with the harmless, temporary pink or reddish tint caused by beeturia). </Li>

What is found in the highest concentration of urine