Following an email from Russ about Charles Freeman’s theory and because David was exploring the painting issues with regard to the Shroud of Turin I thought I would put a few ideas forward. They are on the website under Why the Shroud of Turin is NOT a painting.
A point among others:
You cannot fold and unfold a painting and then repeatedly store it folded without damaging the image along the fold lines. Imagine what the Mona Lisa might look like if it had been treated like the Shroud. The central image down the body of the Man on the Shroud would be missing in the gesso/paint or woodcut print theories because the central fold line was always predominant in the folds for each type of water/fire damage.