Joe Marino sent along this link. An interesting personal account of a visit to Turin, The Holy Shroud: A pilgrimage to Turin in GMA News Online, "The Go-To Site for Filipinos Everywhere":
Just below the brightly-lit yellowish positive reproduction were more thought-provoking and heart-stopping pictures: the negatives of the Holy Shroud. Said to be taken by amateur photographer Secondo Pia in 1898, these were the popular and iconic images of the Holy Shroud. In black and white but sharper now, a distinct countenance with its eyes closed could be clearly limned. The subject’s face was bruised, and its nose fractured. The bony hands and feet had old blood stains and wounds. But what struck me most was the facial expression: sad, desolate, and seemingly reproachful.