i've no idea
not that i haven't had an opportunity to be around it, more that the experiences i've had have yielded conflicting results... sliced my hand open pretty good, basically went into shock - can only hear a high pitched ringing, silver edging on my vision, etc
then a seperate time, sliced my thumb deeply while cutting veggies, so put a plastic glove on and kept going. now, this is a glove with the powder on the inside, and i hadn't done anything to stop the bleeding, so when i took the glove off a half hour later, my entire hand was covered in a congealed layer of blood and powder, and i thought it was the coolest thing ever
apart from that, my only experiences have been when giving blood, at which point i found it rather fascinating...
so who knows