Is carbon dating real
The main part of the shroud does not contain these materials." He speculated that these products may have been used by medieval weavers to match the colour of the original weave when performing repairs and backing the shroud for additional protection.
Based on this comparison Rogers concluded that the undocumented threads received from Gonella did not match the main body of the shroud, and that in his opinion: "The worst possible sample for carbon dating was taken." As part of the testing process in 1988, Derbyshire laboratory in the UK assisted the Oxford University radiocarbon acceleration unit by identifying foreign material removed from the samples before they were processed.
As reported in Nature, Anthos Bray of the Instituto di Metrologia 'G.
Colonetti', Turin, "confirmed that the results of the three laboratories were mutually compatible, and that, on the evidence submitted, none of the mean results was questionable." Although the quality of the radiocarbon testing itself is unquestioned, criticisms have been raised regarding the choice of the sample taken for testing, with suggestions that the sample may represent a medieval repair fragment rather than the image-bearing cloth.
He received 14 yarn segments from Luigi Gonella (from the Department of Physics, at the Polytechnic University of Turin) on 14 October 1979, which Gonella told him were from the Raes sample.
On 12 December 2003, Rogers received samples of both warp and weft threads that Luigi Gonella claimed to have taken from the radiocarbon sample before it was distributed for dating.
that radiocarbon measurements on the shroud should be performed blind seem to the author to be lacking in merit; …
In a well-attended press conference on October 13, Cardinal Ballestrero announced the official results, i.e.
The actual provenance of these threads is uncertain, as Gonella was not authorized to take or retain genuine shroud material, Raymond Rogers stated in a 2005 article that he performed chemical analyses on these undocumented threads, and compared them to the undocumented Raes threads as well as the samples he had kept from his STURP work.
He stated that his analysis showed: "The radiocarbon sample contains both a gum/dye/mordant coating and cotton fibers.
that radio-carbon testing dated the shroud to a date of 1260-1390 AD, with 95% confidence.
The official and complete report on the experiment was published in Nature.
The lab representatives were not present at this packaging process, in accordance with the protocol.