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FTA:

"The Shroud of Turin has a double image—that is, a superficial discoloration on the front surface of the cloth—closest to the body—and a fainter image on the back surface of the cloth—furthest from the body. Both images correspond to each other anatomically…
However, since the image is superficial and doesn’t “soak through” the fibers, there is no discoloration on the fibers between the front surface and back surface of the cloth…. Chemical and vapor explanations of this double image are inadequate, because none of them can explain [this] …. "

Thanks for posting this! I thought I was fairly well-versed on Shroud phenomenology -- but this this is the first mention I've encountered of matching, surface images on both the obverse & reverse surfaces of the cloth.

During my career in micro-fabrication R&D, I did research (leading to several patents) on patterned re-deposition of materials ablated from the surface of a transparent film onto an adjacent surface, using the energy from intense light flashes.

Conceptually, I can envision how ablation from a 3-D (facial contoured) surface could re-deposit as a negative image on a nearby flat surface -- as seen on the Shroud.

That comports well with the body , itself, being the source of the energy burst.

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However, there is no rational (or spiritual) reason or mechanism I can discern for the image appearing on both surfaces of the same section of cloth -- with no intervening image occurring.

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I was comfortable with the concept that an instantaneous (miraculous?) energy-emission from a (disappearing/transforming) shrouded body could cause the observed negative surface image to be transferred to the adjacent shroud.
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BUT -- the described obverse/reverse double imaging shouts "Humbuggery!" to me...

YMMV...

TXnMA