The Fire in 1532 did not alter the C14 to C12 isotope ratios
It has been suggested in the past that the ratio of carbon isotopes may have been changed by a fire that severely damaged the cloth in 1532. Dimitri Kouznetsov, the director of the Sedov Biopolymer Research Laboratories in Moscow, a writer with a propensity to cite imaginary articles in non-existent journals reportedly conducted experiments on ancient linen and had, in his laboratory, changed its carbon 14 date from 200 AD to 1600 AD with intense heat.
Few who understand radiocarbon dating accepted Kouznetsov’s methodologies. Nor did they believe that he could have possibly obtained such results.
The skeptics have had a joyful field day with Kouznetsov's theory. It turns out that the Sedov Biopolymer Research Laboratories in Moscow was his private entity. He may have been the director but he was also its only member. The laboratory where he claimed to have conducted his AMS carbon 14 testing did not exist. The provenance claimed for his samples of ancient linen cannot be verified. The museums that he claimed provided him with samples deny that they did so.
Much of the scientific material on this site is based on the work of Ray Rogers. Rogers, a chemist, is a science Fellow of the University of California, Los Alamos National Laboratory and a charter member of the Coalition for Excellence in Science Education. He has published many scientific papers in peer-reviewed journals and U.S. Government publications. In 1978, together with several other scientists, he was invited to personally examine the Shroud of Turin in Italy for several days. He collected numerous measurements and samples of fibers and particulate materials for further study. Rogers died March 8, 2005..
More information is available from links at Shroud of Turin Story and at A Forensic Science CSI - Pictures of Jesus on the Shroud of Turin