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a photograph is not chemically possible
. . . in referece to the wikipedia text,
Photographic image production
Cellulose fibers that make up the threads of the Shroud's cloth are coated with a thin carbohydrate layer of starch fractions, various sugars and other impurities. This chemical layer, which is thinner than most bacteria, is essentially colorless. However, in some places, the layer has undergone a chemical change that appears straw-yellow. This chemical change is similar to the change that takes place when sugar is heated to make caramel or when proteins react with sugar giving beer its color. And it is the straw-yellow, selectively present in some parts of the carbohydrate layer, that makes up the image we see on the Shroud.
This material is not photosensitive. The chemical change that took place was not produced by light. The images are not photographs of a human body. The face is not a photograph of a human face.
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Why it is not a photographic image production
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