[TXnMA]

Reference re the "caramelization" of the soapwort and, especially of the digital ("dot matrix") nature of the print, please...

I provided a possible analog (not digital) explanation of a molecular coating being projected from a shaped surface, (the body) and producing a 3-D, continuous tone (not half-tone, as you describe) negative image.

But, then, I'm just a believer in Christ, who is also a physical chemist with a background in digital (and analog) imaging at semiconductor scales...

References...?

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(bb & A-G: "backtrack" to #s 32 & 24 for "the rest of the story"...)

[Swordmaker]

References...?

THE SHROUD OF TURIN: AN AMINO-CARBONYL REACTION (MAILLARD REACTION) MAY EXPLAIN THE IMAGE FORMATION— Raymond N. Rogers & Anna Arnoldi—Melanoidins vol.4, 106-113 (2003)

ROGERS’ MAILLARD REACTION HYPOTHESIS EXPLAINED IN DETAIL BY ROGERS HIMSELF— Thibault Heimburger – August 2012.

Here's on by a fellow Freeper, Shroudie, Dan Porter:

Shroud of Turin: Mystery of the Image Chemistry