jake-the-peg, you have misread me. I most certainly did not claim that the shroud is an artefact; my whole argument is that it could not possibly have been because (a) there is no known way in which the marking could have been produced unnaturally, and (b) the "artist" could not have "painted" in negative.
It is the testers who, having dated the cloth to the 14th century, then assumed that it was, ergo, an artefact. But why, when the biggest problems are not concerned with the date of the cloth but wth the image itself?
If you read the book I mentioned then you will see a vast amount of evidence, down to the microscopic level, to demonstrate that the three samples did not come from the shroud. The only claim that it did is made by the Vatican officials who handed over the sealed samples. Faced with scientific evidence on the one hand and the word of professional religionists on the other, I know which I prefer.
This is why I object to the injection of religion into the study. If the Vatican itself secretly believes the cloth to be the shroud of Jesus, and that the markings were made naturally by a combination of sweat and unguents, then they would be very concerned because the blood was obviously still flowing while the body was in the shroud. And corpses don't bleed.
But that aspect doesn't concern me. So far I think the only explanation is such a natural one, without the religious decoration. I repeat, not an artefact. Read the book.