Didn't a Russian scientist claim extreme heat could effect carbon dating?
In 1994, a Russian archeological biologist and chemist, Dmitri Kouznetsov, claimed to have experimentally proven that the carbon 14 content of a piece of linen could be changed by intense heat. (biofractionalization and the chemical bonding, under heat, of extrinisic C14 to the linen). Scientists who understand carbon dating doubted it.
No one was able to reproduce his experiments. It seemed to many people that he never conducted the experiments at all. His claims that he collected samples of ancient cloth from specific museums, which he named, turned out to be false as well. Kouznetsov, the scientist, was coming unraveled.
He also came under suspicion in the scientific community because he was claiming that biological evolution was impossible. It was also discovered that papers written by him were found to have numerous citations to other papers that did not exist. Kouznetsov was a fraud.
A few Shroud researchers, who for a short while embraced Kouznetsov’s finding, were embarrassed. But the claim that scorching heat affected the carbon dating lives on in web site after web site. The Internet has an amazing propensity for replicating bad information.