 Schwortz reexamined false-color x-ray fluorescent photographs of the Shroud taken by STURP and pointed out that the sample for radiocarbon dating was taken from the only section that showed up green, indicating it had different chemical properties from the rest of the Shroud, but no one had previously paid attention to the color difference because the green portion is from a section that does not contain part of the image.In December 2008, the Discovery Channel in the United States presented a documentary titled "Unwrapping the Shroud