I suggest you look at Walter C. McCrone's book Judgement Day for the Shroud of Turin, Prometheus Books, Amherst, NY, 1999, there is a fair amount in the book about the "blood" on the shroud. Pages 162-166 are very interesting in this regard.I've been digging around trying to get something solid on the blood samples thing, for both the shroud and the Sudarium. Not coming up with much, mostly just a lot of "no dude seriously, it's AB, just trust us".
For Example:
"They [The STURP people.] believe the "blood" is blood because they find calcium and iron. Bu, they found no potassium, an even larger component of blood. A standard sample of blood in The Particle Atlas (McCrone et al. 1992) shows a strong potassium peak. Blood 48 parts per million (ppm) of calcium, 512 ppm of iron but 1586 ppm of potassium. Figures 65 and 66 (pp. 163, 164) show the elemental analyses of real blood and red ochre "blood" on the shroud. The potassium (K) peak in figure 65 is obvious as one of the strongest. The potassium peak is absent in STURP's X-ray fluorescence pattern taken of the shroud side wound image. Therefore, this did not prove blood to be present, quite the contrary." (p. 162)
Figure 65:

(p. 163)
Figure 66:

(p. 164)