I'm not usually much into the Shroud debates, but I thought this was interesting.
The Italian researchers, who conducted dozens of hours of tests with X-rays and ultraviolet lights, said that no laser existed to date that could replicate the singular nature of markings on the shroud. They also said that the kind of markings on the cloth could not have come from direct contact of the body with the linen.
Previous investigation has determined the markings could not have come from pigments or dyes.
The Italian scientists said the marks could only have been made by “a short and intense burst of VUV directional radiation.”
Such technology did not exist in the time the skeptics claim the shroud could have been forged.
My question from the standpoint of science is: because you need a vacuum for VUV (hence the first "V") can the intensity of the UV light overcome the ability of the atmosphere (limited in a sealed tomb) to absorb the energy? After all, frequency is only one dimension of the wave.