ABSTRACT
This chapter discusses the nature of the purported blood stains, and searches for the specific characteristics of the blood. It reconstructs the mechanism of formation and describes every type of “blood” stain. The presence of human blood on the Sudarium of Oviedo has been verified by different specialists throughout the years. Goldoni undertook the identification of the blood group ABO knowledgeable about the difficulties that this task would involve. He found the presence of the typical agglutinogens A and B. Villalain with other specialists searched for the determination of the ABO group and the tests were applied on stained samples and clean samples as control. Stained samples indicated weak group A and positive B. The detection of human haemoglobin by immune-chromatography test was negative. Fibrin is a fibrous, non-globular protein involved in the clotting of blood.
