It is certainly worth taking the time to read since it illustrates how complicated that question can be. Stephen lists three possible answers that may be held by those who are what he calls “pro-authenticists.”
1) A full washing of Jesus’ body and a later oozing of blood This was the position of the lateFrederick Zugibe (1928-2013), the Chief Medical Examiner of Rockland County, New York:
"The body unquestionably would have been covered with blood because the heart pumps about 4,500 gallons of blood through the more than 60,000 miles of large and small blood vessels throughout the whole body each day. Instead of the very exact imprints of the wounds, the Shroud would bear large indistinct masses of blood over the entire image, including the face, arms, hands, feet, and trunk."
But then Zugibe has a problem. If Jesus’ body was fully washed, how does he account for the fact that there is still blood on the Shroud? Zugibe’s unconvincing and inconsistent answer is that after Jesus’ body was washed, blood that was still in the wounds then oozed out onto the Shroud…
2) An incomplete washing due to shortness of time, leaving some blood on the Shroud This is a possible pro-authenticist position on the washing of Jesus’ body, although I don’t know of anyone who has held it. But as we saw above, since there was insufficient time for the full Jewish burial rites (see below), Joseph and Nicodemus would have postponed the washing of Jesus’ body (if there was to be one – see future) until after the Sabbath. And, as we saw, the bloodstains and dirt on Jesus’ face were not washed, which surely they would have been, even in an incomplete washing. So this second possible pro- authenticist position on the washing of Jesus’ body is also refuted by the evidence.
I guess I am in the minority or maybe even the group of none ( make that now one). I just don’t buy arguments like “surely they [=the wounds on Jesus’ face] would have been,” given that we know so little about what really happened, and why so, some 2000 years ago. Moreover, I do find Zugibe quiet convincing for the most part.