Using isotopes, this study traced hemoglobin breakdown products after hemoglobin injection into rabbit vitreous. Elimination of breakdown products was rapid during the first week, and after one month only 10% of the initial radioactivity was detected. Chromatography strongly suggests that a bilirubin-like product is present 18 days after injection.
Vitreous Hemorrhage: An Experimental StudyII. Hemoglobin Degradation. Arch Ophthalmol. 1970;83(4):466-469. doi:10.1001/archopht.1970.00990030466015