National Geographic : 1980 Jun
Pilgrims of science, with white-glove care, anchored the shroud to a rotating frame designed for an exhaustive series of tests (above). Organized as the Shroud of Turin Research Project, more than thirty Americans worked nonstop for five days alongside Italian scientists.An early discovery: "Blood" images, unlike body images, penetrate the shroud and are dense enough to be visible under back lighting (right). But is it blood? BiophysicistJohn Heller, silhouetted before minute shroudfibrils (above right), ran chemical and spectroscopictests on fibrils and concluded, "It's hemoglobin." But he and other team members plan more tests.