Submitted by DwagonFyre t3_xxadwj in askscience
rvralph803 t1_ircixr4 wrote
Reply to comment by MourkaCat in What happens when a bruise heals? by DwagonFyre
Bilin, a byproduct of breaking down hemoglobin. It's also why poop is brown.
Submitted by DwagonFyre t3_xxadwj in askscience
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