The scientific debate surrounding the Shroud of Turin has entered a new chapter. In recent days, the journal Archaeometry published a detailed rebuttal to a hypothesis proposing that the cloth’s image was produced in the Middle Ages using a bas-relief.
Last summer, Brazilian researcher Cicero Moraes argued that a three-dimensional digital reconstruction supported the idea of a medieval artistic technique. According to Moraes, the contours visible on the Shroud correspond more closely to contact with a bas-relief sculpture than to the projection of a real human body onto linen.
Now, three specialists —Tristan Casabianca, Emanuela Marinelli, and Alessandro Piana— have challenged that conclusion in the same journal that originally published Moraes’s article. Their critique echoes concerns voiced in 2025 by Roberto Repole, the Shroud’s custodian, and by the International Center for Shroud Studies in Turin. What gives this exchange particular weight is that both argument and rebuttal appear within Archaeometry itself, a respected academic forum.
A debate more than a century old
Controversy has surrounded the Shroud since 1898, when photographer Secondo Pia produced the first photographic negative, revealing striking details invisible to the naked eye. Since then, scientific inquiry has moved from darkrooms to laboratories and digital modeling.
In 1989, carbon-14 dating published in Nature suggested a medieval origin (1260–1390). Yet in 2019, a reanalysis of the raw data—also published in Archaeometry—called aspects of that testing into question. The discussion has remained lively and technical, unfolding largely in peer-reviewed journals rather than popular media.
Methodology under scrutiny
Casabianca, Marinelli, and Piana argue that Moraes’s model rests on significant weaknesses. They note anatomical inconsistencies in the digital reconstruction, including reversed right and left features and a chosen body height outside commonly accepted estimates. The study relies on a single 1931 photograph despite the availability of more recent high-resolution images. Moreover, the simulation was conducted on cotton rather than linen.
More fundamentally, the critics contend that the bas-relief hypothesis fails to account for two defining characteristics of the Shroud: the extreme superficiality of the image—measured at only a fraction of a thousandth of a millimeter in depth—and the multiple independent confirmations of bloodstains. Both features, they argue, resist explanation by medieval artistic techniques.
The rebuttal also points out that variations of the bas-relief theory were explored and rejected in the early 1980s, and that the problem of image deformation from body to cloth had already been examined as early as 1902 by French scientist Paul Vignon.
Historical questions
Beyond technical issues, the authors question the historical plausibility of the hypothesis. Moraes draws connections across disparate times and places to suggest how a medieval artist might have conceived such an image. Yet none of the cited artworks depicts a naked, post-crucifixion Christ shown both front and back—the Shroud’s most distinctive feature.
Even the art historian William S. A. Dale, whom Moraes references, believed the image could not have originated in 14th-century France, suggesting instead a Byzantine context centuries earlier.
In his published reply, Moraes maintains that his work offers a strictly methodological exploration of morphological deformation. The exchange underscores a broader lesson: Modern digital tools can illuminate ancient mysteries, but extraordinary claims require careful historical grounding as well as technical precision.
For believers, the Shroud remains a powerful icon of Christ’s Passion. For scholars, it continues to demand intellectual rigor. More than a relic of the past, it is a reminder that faith and science, when pursued honestly, both seek the truth.
