Prof Paolo Di Lazzaro, the head of the team, said: "When one talks about a flash of light being able to colour a piece of linen in the same way as the shroud, discussion inevitably touches on things like miracles and resurrection." "But as scientists, we were concerned only with verifiable scientific processes. We hope our results can open up a philosophical and theological debate but we will leave the conclusions to the experts, and ultimately to the conscience of individuals."