Fringe theories about the Shroud of Turin
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The Shroud of Turin is a length of linen cloth bearing the imprint of the image of a man, and is believed by some to be the burial shroud of Jesus. Despite conclusive scientific evidence from three radiocarbon dating tests performed in 1988 which resulted in the shroud being dated to 1260–1390 AD, some researchers have challenged the dating based on various theories, including the provenance of the samples used for testing, biological or chemical contamination, incorrect assessment of carbon dating data, as well as other theories. However, the alternative theories challenging the radiocarbon dating have been disproved by scientists using actual shroud material, and are thus considered to be fringe theories.
The Holy See received custody of the shroud in 1983, and as with other relics, makes no claims about its authenticity. After the 1988 round of tests, no further dating tests have been allowed.