The Technical Examination of a Painting that Passed Through the Hands of Sienese Restorer and Forger Icilio Federico Joni
Bibliographic record
Abstract
A panel painting of the Crucifixion belonging to the Fogg Art Museum and attributed to an imitator of the 14th-century northern Italian painter Altichiero underwent technical examination to address questions about its authenticity. Suspicions about the painting had been raised on technical grounds and because it was purchased from the famous Sienese restorer and forger Icilio Federico Joni (1866–1946). The materials and technique of the painting were studied and compared to 14th-century Italian panel painting practices and to restoration and forging techniques described by Joni. The examination shows that the distinction between a heavily restored painting and a fake can be ambiguous, particularly when only a vestige of the original remains. The issues raised when dealing with such “renovated ruins,” as well as the social context that created an environment conducive to the production and marketing of fakes in Italy in the late 19th and early 20th centuries, are also discussed.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.010 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".