Peroxide, as suggested above, is a great call. Biggest thing I've learned is to treat the blood trail like a forensic scene. A lot of people destroy evidence by getting excited, going too fast and walking over fine blood spots that can tell a lot of the story. Once you put together a general direction of travel an animal has taken, think like an animal- what would be the most logical path for you to take if you had a ton of adrenaline pumping? Generally, they will run like a source of water- downhill, with the least resistance. That and any of the bright white lights are a good start.I dont know if there is truly a good brand or type of flashlight or headlamp that helps illuminate blood spots for tracking.
Any first hand experience would be greatly appreciated.