Pretty remarkable that no blood was found at the scene yet they managed to identify all 44 passengers with only 8% of their total mass. I little too remarkable for my taste.
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Blood is they first substance in your body to start decomposition. It will still be there but It will not look like blood to the naked eye
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It all decomposed in 10 minutes?
So we start with the idea that identifying all the victims on 93 was incredible because there was no apparent blood or more specifically that only 8% of the victims's bodily mass was recovered. This was replied to as any blood spilled (I use the term loosely given that it was a violent crash) would decompose though I would say that it would coagulate, dry up (which would change its color I believe). This was replied to as if decomposition meant that there would be no blood remnants remaining in the 10 minutes (I presume referring to the arrival of responders after the crash).
First, I would point out that in past, before things like DNA analysis, the result of a crash like 93 would likely have been a mass grave for all the victims. Indentifying indivduals or individual remains would not have been reasonably possible due to the violence of the impact and the destruction of the physical bodies (by destruction I mean rendering into tiny pieces, ok). Though if something like a jaw fragment with some intact teeth was found there might be an identification via dental chart.
I would point to
The Joint POW-MIA Accounting Command in Hawaii as an example of how far the art and science of identifying remains has progressed. IIRC, in many cases, they have to deal with people dead for decades and recovered in pieces, often tiny pieces.
Second, while it is true that blood would decompose (and coagulate/clot and dry out) it should not be forgotten that a person normally has only a couple of gallons of blood in their body. That's roughly 16 pounds of blood and with 44 people we're talking on the order of 700-800 pounds of blood in a crash scene where a couple hundred thousand pounds of aircraft crashed rather directly (i.e. violently) into the ground at high speed (500 mph). To expect that responders would find things like pools of blood or blood dripping off the trees is not reasonable. The responders would be lucky to find identifiable body parts much less enough to identify a particular person without referring to things like dental charts and such.
The closest comparison I can think of would be to take a ballon or bag filled with a couple gallons of water (dyed for identification) and slam it into the ground at 500 mph and see the result. If one would prefer, try taking 80-90 gallons in one container and doing the same thing. I am fairly sure one would not find pools of water nor any significant amount of water dripping off anything in the near vicinity. And this is just dealing with what might happen to the blood without considering all the other stuff crashing into the ground at the same spot. Admittedly this is a simplistic comparison.
So is there a problem with the responders not finding pools of blood or blood dripping off trees and such, or that they could only collect a small amount of the total body mass of the victims with which to try and effect an identification? In most, if not all, of the cases, they were seeking to identify the particular remains as belonging to one of a known set of people, not trying to effect an identification of a complete unknown.