Person

Secondo Pia

Secondo Pia (1855-1941) was an Italian lawyer and amateur photographer who, on 28 May 1898, took the first photograph of the Shroud of Turin during a public exhibition. Developing his glass-plate negatives that night, he discovered that the Shroud's faint, blurry positive image resolves on the photographic negative into a high-contrast, anatomically detailed portrait of a scourged and crucified man. The cloth, in other words, behaves as if it were itself a photographic negative, a property no one had suspected before.

Significance

Pia's discovery reframed the Shroud as a scientific puzzle rather than a purely devotional object. The "negative-on-negative" property is difficult to reconcile with medieval painting (no medieval artist is known to have worked in tonal inversion, and the resolution exceeds plausible technique) and is one of the load-bearing planks in modern authenticity arguments. Pia was initially accused of fraud; subsequent re-photographing in 1931 by Giuseppe Enrie confirmed his result.