I’ve always surmised that the image was due to ionizing radiation emanating from a piece of statuary made of rock containing radioactive materials. The early Byzantine history of the Image of Edessa claims that the original stood untouched in the walls of Edessa for five hundred years, and was found in the company of an exact duplicate of the cloth image on a “tile.”
We have a shroud expert in the forum. In the meantime, click on the SHROUD STORY link posted above for the most current scientific research.
Why then are there no other comparable images in all of recorded history?
And how can the fact that the rare blood type found on the Shroud (AB, which occurs in about 3% of the population) matches the blood type on the Sudarium of Oviedo and the Eucharistic Miracle of Lanciano be explained?
Your surmise is wrong. We now know what the image is made of.
It is the result of a chemical reaction between the starch and polysaccharide fractions of an extremely fine coating of glucose, fucose, galactose, arabinose, xylose, rhamnose, and glucuronic acid, left over from the retting and fullering of the yarn that was spun and then woven to make the Shroud cloth with gases, cadaverine and putracine, that exude from a dead body forming a light brown caramel like substance. No ionizing radiation is required.