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a bas-relief rubbing is not chemically possible
. . . in referece to the wikipedia text,
Using a Bas-Relief
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 paint, powdered or otherwise. The images are not produced by pigment
Return to summary of why it is not a bas relief rubbing.
Using a Bas-Relief
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