Hey Paul, that experiement with the blood and noto. I've got an important question.
How fresh was the blood? Blood that has been exposed to air at all will begin to coagulate immediately, so if the blood wasn't absolutely fresh, ie a live donor, then it's not really a valid test. Using the waza as a model for combat in a typical one on one or one on two encounter, the time between the blood contacting the blade and chiburi, at most 15 seconds go by. Forumulating a definitive test for this is gonna be difficult, because you have to extract fresh blood and perform the test within 15 seconds.
Personally I believe chiburi is only really meant to get the worst of it off. I believe a good bit more can be removed by the fingers of the left hand during noto(at least the way we do noto), and what is left is good enough until you can get away from the site of the fight and the potential for retribution from your enemies cohorts.
Charles Mahan
Iaido - Breaking down bad habits,
and building new ones.