Mr. Savage:
You have demonstrated that you do not understand, even at an informal level, the concept of "probably".
MRC_Hans used the term, "may", and, absent other evidence, it would be polite to accept the term at face value.
Given that the discolorations at issue cannot possibly have been actual human blood flowing from actual injuries inflicted on an actual human body (vice the issues of physics, adsorption/absorption, 1st Century CE funerary practices, et al.); and,
Given that the tests performed by H & A discovered, not blood, but porphyrins (a class of organic pigments); and,
Given that any red pigment available in the mid-13th Century CE would have contained poryphin-bearing organic pigments (which were the only widely available reds and browns --even umber and ochre pigments will have some porhyrins in them); then
At best, the "detection" of porphyrins in some of the discolorations on the CIQ can, at best, be said to indicate that the discolorations "MAY" indicate the presence of blood.
May. Might. Could. Maybe.