While in a home improvement center

warehouse buying paint, a 35-year-old man struck on the leg by a falling pallet

rack, which strikes him on his thigh. The skin is not broken. Within 2 days

there is a 5 x 7 cm purple color to the site of injury. Which of the following

substances has most likely accumulated at the site of injury to produce a

yellow-brown color at the site of injury 16 days later?