John L. Brown on the evidence that the carbon dating sample was invalid.
Ray Rogers also provided some material from the area of the Shroud from which the carbon dating samples had been taken to John L. Brown, formerly Principal Research Scientist at the Georgia Tech Research Institute's Energy and Materials Sciences Laboratory at the Georgia Institute of Technology.
Brown studied the samples independently and with different methods, including a Scanning Electron Microscope. Rogers hoped for independent confirmation and he got it. Of one particular set of microscopic images, Brown wrote:
This would appear to be obvious evidence of a medieval artisan’s attempt to dye a newly added repair region of fabric to match the aged appearance of the remainder of the Shroud.
Brown is one of several scientists who have confirmed Ray Rogers conclusion that the 1988 carbon dating of the Shroud of Turin is invalid.