It hasn’t been done … because up until now it CAN’T be done.
The shroud is basically a photographic negative, and if the Carbon-14 dating was accurate then it was produced at least 500 years before photography was even invented. That’s like examining an archaeological dig of a Cristopher Columbus landing site from 1492 and finding a space shuttle there.
The expression, "photographic negative," refers to a image of a scene where the bright parts of scene appearing dark and the dark parts of a scene appearing bright. It doesn't mean that the Shroud of Turin image was actually a photographic negative produced by the same chemicals using in 19th-20th century photography.