Recently, an oil-on-panel painting, portraying Leonardo da Vinci, was found in the monastery of Camaldoli (Arezzo, Italy). The painting comes from a private donation and, over time, it never was moved from the monastery or loaned to museums or art galleries for exhibitions. Historians hypothesise that the painting could be a seventeenth-century copy of a portrait or a self-portrait of Leonardo da Vinci. Although, almost certainly, the panel was not signed by Leonardo, it raised a great interest for art experts, since the copy could be the outstanding testimony left to us of an original Leonardo's masterpiece, which is gone lost. The ICRCPAL in Rome, in collaboration with the ISPC-CNR and the INFN-LNS of Catania, started a scientific investigation of the painting based on the use of non-invasive techniques. Macro X-ray fluorescence imaging technique (MA-XRF) was employed to document, for the first time, the nature of original pigments composing the pictorial and priming layers. The results allowed to better elucidate the painting technique, also to know the original look of degraded areas, suggesting an appropriate restoration and conservation policy. Novel information has been obtained concerning the pictorial process, since elemental distribution maps revealed an underpainting below the Leonardo portrait. Despite the cleaning process of the panel before its reuse, some pictorial details remained visible to the MA-XRF analysis, allowing to infer the presumed figure hidden behind the figure of Leonardo.

中文翻译：

---

列奥纳多·达·芬奇肖像上的原位宏观 X 射线荧光扫描

最近，在卡马尔多利修道院（意大利阿雷佐）发现了一幅描绘列奥纳多·达·芬奇（Leonardo da Vinci）的油画面板。这幅画来自私人捐赠，随着时间的推移，它从未从修道院搬出或借给博物馆或艺术画廊展出。历史学家假设这幅画可能是列奥纳多·达·芬奇 (Leonardo da Vinci) 肖像或自画像的 17 世纪副本。尽管几乎可以肯定，该小组没有由列奥纳多签名，但它引起了艺术专家的极大兴趣，因为该副本可能是留给我们的杰出见证，证明了已失传的列奥纳多原创杰作。位于罗马的红十字国际委员会与 ISPC-CNR 和卡塔尼亚的 INFN-LNS 合作，开始基于使用非侵入性技术对这幅画进行科学调查。宏观 X 射线荧光成像技术 (MA-XRF) 首次用于记录构成图像和底漆层的原始颜料的性质。结果可以更好地阐明绘画技术，还可以了解退化地区的原始面貌，提出适当的修复和保护政策。由于元素分布图显示了莱昂纳多肖像下方的底漆，因此获得了有关绘画过程的新信息。尽管面板在重新使用之前进行了清洁过程，但 MA-XRF 分析仍然可以看到一些图片细节，从而可以推断出隐藏在莱昂纳多身后的推定人物。结果可以更好地阐明绘画技术，还可以了解退化地区的原始面貌，提出适当的修复和保护政策。由于元素分布图显示了莱昂纳多肖像下方的底漆，因此获得了有关绘画过程的新信息。尽管面板在重新使用之前进行了清洁过程，但 MA-XRF 分析仍然可以看到一些图片细节，从而可以推断出隐藏在莱昂纳多身后的推定人物。结果可以更好地阐明绘画技术，还可以了解退化地区的原始面貌，提出适当的修复和保护政策。由于元素分布图显示了莱昂纳多肖像下方的底漆，因此获得了有关绘画过程的新信息。尽管面板在重新使用之前进行了清洁过程，但 MA-XRF 分析仍然可以看到一些图片细节，从而可以推断出隐藏在莱昂纳多身后的推定人物。