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Albertus Magnus (1193/1206–80) discovered silver nitrate and noted that it could blacken skin. Silver nitrate would later be used as a light sensitive material in the photographic emulsion on photographic glass plates and film.

Georg Fabricius (1516–71) discovered silver chloride, later used to make photographic paper...

There is no silver on the Shroud of Turin to hold an image.

The real problem with the photography theory is it cannot account for the terrain map 3D data encoded in the image. No mere photograph does. Physicists who study light have found no light artifacting on the Shroud which would exist were it a photograph. It only appears to be a photographic negative, but it isn’t. The data is distance encoded representing distance a body part has to the surface of the cloth. I.e., the closer the body part, the more intense the image gradient. The image disappears to the naked eye by about 2.5 to 4 centimeters, light does not work that way. That’s why attempts to replicate the Shroud using photographic techniques never look like the Shroud in detail, failing in significant ways. . . Primarily because light doesn’t care about distance. . . It’s affected by shadows and highlights.

However because there is no shadowing on the Shroud, computer enhancement does bring out body details at greater distances than the human eye can discern, for example, Barrie Schwortz told me that it has been determined that the Man on the Shroud was circumcised.