Dude, that’s awesome; but, as a resident medical nerd, I feel the need to encourage you to be more careful and will not hesitate to pull academic articles about the long-term dangers of head trauma
Noted
You probably should be avoiding bloody head wounds, for general well-being
However, blood behaves the same with most mediums, so how it would behave in hair is predicable
How often are you dealing with traumatic head wounds?