The other tidbit I picked up from the program is that the sample was selected not by the scientists or the photographers who knew that corner was contaminated.
The original agreed protocol for the sampling involved taking eight samples from eight different locations on the Shroud including image and non-image areas. Those samples would be unwoven into threads and then control threads from other old cloths, as well as the actual samples from the Shroud, would be sent to SIX different C14 labs. Instead, the protocols were changed literally at the last hour to only take ONE sample from ONE area and that was taken from the one area that the scientists who had prepared the original protocol had agreed to avoid because of anomalies. Four sub-samples plus a retained sample were cut from that one master sample and sent to only THREE labs. The Arizona lab got two while London and Zurich got one each. The samples were sent fully woven and easily identified as the Shroud as it was the only one that was herringbone weave (three over one) while the control samples were simple one on one weave. In other words, the whole thing was a botched job from the moment the protocols were discarded in favor of something simpler... and poorly thought out.