black urine

black u·rine

the dark urine of melanuria or hemoglobinuria.
A clinical finding which may be pathological or nonpathological
Pathological Excess of various pigments, including homogentisic acid—e.g., methemoglobin, haemoglobin, alkaptonuria
Nonpathological Presence in the urine of cascara, iron-sorbitol-citric acid complexes, levodopa, radiocontrast media, methocarbamol, naphthol, phenols, pyrogallol, salicylates, diatrizoates