On the blood:
"It is claimed that there is type AB blood on the shroud. However, no blood has been identified on the shroud of Turin. Dried, aged blood is black. The stains on the shroud are red. Forensic tests on the red stuff have identified it as red ocher and vermilion tempera paint. In any case, if there were AB blood on the shroud, not only could it be the blood of a person wrapped in the shroud, it could also be the blood of the creator of the shroud or of anyone who handled the shroud. But, the evidence is that there isn't any blood on the shroud."
From Skeptic.com
"It is claimed that there is type AB blood on the shroud. However, no blood has been identified on the shroud of Turin. Dried, aged blood is black. The stains on the shroud are red. Forensic tests on the red stuff have identified it as red ocher and vermilion tempera paint. In any case, if there were AB blood on the shroud, not only could it be the blood of a person wrapped in the shroud, it could also be the blood of the creator of the shroud or of anyone who handled the shroud. But, the evidence is that there isn't any blood on the shroud."
From Skeptic.com
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