Shroud of Turin and the Skeptical Inquirer  > FAQ

Skeptical Inquirer's Shroud of Turin Questions

Return to List of Skeptical Questions

The true skeptical inquirer wonders . . .

Doesn't old blood turn black? The bloodstains on the Shroud are red. Isn't this a problem?

That the bloodstains are real blood has been proven over and over by many scientists working independently of one another.

It is true that old blood normally turns black. The reasons it is red are simple. Ancient cloth, as it was manufactured in the the Middle East during the first century, was starched on the loom and then washed in suds of the Soapwort plant. Ingredients of this natural soap are hemolytic, which would keep the blood red. We know, as well, that the blood on the Shroud is rich in bilirubin, a bile pigment produced when a human body is under severe traumatic stress. Bilirubin is bright red and stays red.

Return to List of Skeptical Questions

Shroud of Turin and the Skeptical Inquirer


Fact: The 1988 carbon 14 dating used invalid samples snipped from a discrete medieval repair. Furthermore, kinetics constants for the loss of vanillin from lignin indicates that the cloth is at least twice as old as the dates determined by the carbon 14 dating with the faulty samples.

By some estimates, from examination of documenting photographs, there is sufficient new thread (about 60%) to allow adjusting the cloth's date to approximately the first century.

Fact: The images are formed by a brownish, complex conjugated carbon substance within a carbohydrate layer of starch fractions no thicker than 1/100 the diameter of a human hair.

The images are probably the product of an amino/carbonyl reaction.

Fact: The bloodstains are real blood. The blood is unusually red for old blood.

The blood probably stayed red and did not turn black as blood normally does because trace chemicals found in the starch fractions are hemolytic. Also, the blood is rich in bilirubin, a bile pigment produced when a human body is under severe traumatic stress. Bilirubin is bright red and stays red.

Fact: There is a faint, superficial face image on the back of the cloth.

This supports the hypothesis of an amino/carbonyl reaction.

Fact: There are sufficient descriptive historical records to suggest that the Shroud of Turin is the Edessa cloth (ca. before 544 to 944 CE) and the Bucoleon Palace grave cloth of Constantinople (ca. 944 - 1204).

Fragmentary evidence suggests that the Edessa Cloth originated in Jerusalem in the 1st century and that it is the burial cloth of Jesus of Nazareth.