All  

porphyrin

The Shroud of Turin: modern, digitally processed image of the face on the cloth

Blood on the Shroud: An Interview with the Blood Investigator of the Shroud of Turin Research Project

In 1978 a large team of American scientists under the auspices of the Shroud of Turin Research Project (STURP) spent over two years prior to embarking for Turin, planning a large number of specific...