I have read many articles and published papers in journals, and it seems that no one can definitively say whether this Shroud is a fake depiction of Jesus, or if it is real.
In any event, does it really matter ?
"Since 1978, it was widely reported that the change of color was a change within the fiber; that somehow part of the fiber had turned brown. That isn't the case. Instead, it is a change of color, in various places, to a thin filmy substance that coats some of the fibers. To drive home two important points: 1) the filmy substance only coats some of the fibers and 2) only in some places has the substance changed color.
Chemists know what this filmy substance is. And they also know what chemistry is needed to cause it to change color. The change, visual bits of color, here and there, when viewed at a distance are pictures of Jesus. The pictures on the Shroud of Turin are chemical pictures -- plural because there are two pictures: one of Jesus' front and one of Jesus' backside.
The substance is a dried carbohydrate mixture of starch fractions and various saccharides (sugars). It is as thin (180 to 600 nanometers) as the wall of a soap bubble. It is thinner than the invisible glare proof coating on modern eyeglasses.
The coating is only found on the outermost fibers of the thread. In fact, it is only found where the fibers are close to the surface of the Shroud's cloth. In other words, the fibers inside the thread, deep in the cloth, do not have this filmy substance."
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http://www.shroudforum.com/
In my personal opinion, I think it is a hoax.
Why ?
Because the Bible specifically states that Jesus was no longer recognizable as a man, after the beating he received from the Romans.
He was nothing but a bloody pulp...the image of "Jesus" on the Shroud is incredibly detailed and immaculate, showing the face of a man that has NOT been beaten.
I have nothing else to go on, really, but that is how I see it.