Did Walter McCrone find blood on the Shroud of Turin?
According to the McCrone Associates web site: “There is no blood in any image area, only red ochre and vermilion in a collagen tempera medium. However, Alan Adler, an expert on porphyrins, the types of colored compounds seen in blood, chlorophyll, and many other natural products concluded that the blood is real. In collaboration with John Heller, the conclusions that the blood is real was published in the peer-reviewed scientific journal Applied Optics [19, (16) 1980]. The heme was converted into its parent porphyrin, and this was confirmed with spectral analysis. In addition, the x-ray-fluorescence spectra taken by other scientists showed excess iron in blood areas, as expected for blood. Microchemical tests for proteins were positive in blood areas but not in any other parts of the Shroud. McCrone did not publish his finding in peer-reviewed scientific journals. Every other scientist who has physically examined the fibers from the Shroud disagrees with McCrone. His findings have not
