Jabba:
1. Adler and Heller’s work isn’t conclusive. They found circumstantial evidence for blood.
“With regard to the "blood," Meacham cites the tests by two nonforensic scientists, none of which were specific for blood. Forensic expert John Fischer finds their conclusions untenable. In fact, similar results can be obtained with a tempera paint.” - “Comments on The Authentication of the Turin Shroud: An Issue in Archaeological Epistemology”.
http://www.shroud.com/meacham2.htm.
2. Adler and Heller present subjective opinions as evidence. They interpret some white marks near the “blood” as serum. Dr. Barbet interprets it in different ways, i.e. as being water.
3. Their conclusions aren’t quantitative. It is impossible to discuss and reduplicate them.
4. Frache and McCrone did tests for blood and all were negative. A&H reply they weren’t suitable for ancient blood. But A&H never justify their tests in that sense. A&H tests are personal methods never tested in Archaeometry. You can look for them with Google. You will not find any article doing reference of them.
5. Even if A&H had demonstrated the presence of blood on the Shroud, their tests will be non conclusive because hypothetical blood could have been painted.
6. Bood or not blood, stains on the back of neck aren’t natural marks. They were painted.
Conclusion:
“There is no blood on the Shroud: all the forensic tests specific for blood have failed18 (although some investigators unrigorously concluded that blood was present after conducting numerous forensic tests for iron, protein, albumin, etc., which came up positive because these materials are indeed on the Shroud in the form of tempera paint). Old blood is not bright red, and no amount of bilirubin can explain that away. Real blood mats on hair, and does not form perfect rivulets and spiral flows. Real blood does not contain red ochre, vermilion, and alizarin red pigments. Real blood and its organic derivatives have refractive indices much less than red ochre or vermilion, and they can be easily distinguished using Becke line movement under a light microscope. McCrone's examination of the red particles on the Shroud samples revealed no blood or blood derivatives.”. (STEVEN D. SCHAFERSMAN: “Unraveling the Shroud of Turin”)