I am quite sure that it is, as I have said repeatedly, archelogically the Shroud of a 1st century crucifixion victim. I think the inference that it is Jesus is reasonable, in fact close to certain. Is there a miracle involved in the Shroud. In a sense, I think so. But I'm not sure what it is.
Do I believe in miracles? Yes. I once did not. Do I believe that Jesus is the Christ? Yes, I do. That he was resurrected? Yes, I do. Does the Shroud affect my faith? No, but I find it wonderfully mysterious and inspiring.
Am I willing to investigate and think about things? Sure, and the science of the Shroud is compelling as is the history; least to people who are open minded.
The point of this thread has been to understand and discuss the second image on the Shroud. It lends credence to the idea that the Shroud is authentic.
Now your understanding of negatives is a bit faulty. It really doesn't make sense that a positive image must be whiter, as you suggest. How do you explain that to every artist who has ever started with a white canvas. Come on blam blam, do some thinking before you type. Shroudie