用汞 L 辐射的快速高动态范围元素 X 射线荧光成像技术恢复已严重损坏、无法辨认的 19 世纪银版照片。
Recovery of Degraded-Beyond-Recognition 19 Century Daguerreotypes with Rapid High Dynamic Range Elemental X-ray Fluorescence Imaging of Mercury L Emission.
机构信息
The University of Western Ontario, The Department of Chemistry, 1151 Richmond Street, London, Ontario, N6A 5B7, Canada.
The University of Western Ontario, The Department of Anthropology, 1151 Richmond Street, London, Ontario, N6A 5C2, Canada.
出版信息
Sci Rep. 2018 Jun 22;8(1):9565. doi: 10.1038/s41598-018-27714-5.
A daguerreotype image, the first commercialized photographic process, is composed of silver-mercury, and often silver-mercury-gold amalgam particles on the surface of a silver-coated copper plate. Specular and diffuse reflectance of light from these image particles produces the range of gray tones that typify these 19 century images. By mapping the mercury distribution with rapid-scanning, synchrotron-based micro-X-ray fluorescence (μ-XRF) imaging, full portraits, which to the naked eye are obscured entirely by extensive corrosion, can be retrieved in a non-invasive, non-contact, and non-destructive manner. This work furthers the chemical understanding regarding the production of these images and suggests that mercury is retained in the image particles despite surface degradation. Most importantly, μ-XRF imaging provides curators with an image recovery method for degraded daguerreotypes, even if the artifact's condition is beyond traditional conservation treatments.
银汞合金 daguerreotype 图像是第一种商业化的摄影工艺，由表面镀银的铜板上的银汞和（常常）银汞金汞合金颗粒组成。这些图像颗粒对光的镜面反射和漫反射产生了典型的 19 世纪图像的灰度范围。通过使用快速扫描的同步加速器微 X 射线荧光（μ-XRF）成像对汞的分布进行映射，可以非侵入式、非接触式、非破坏性地恢复全幅人像，尽管这些人像受到广泛腐蚀，但肉眼完全无法看到。这项工作增进了对这些图像制作过程的化学理解，并表明汞被保留在图像颗粒中，尽管表面发生了退化。最重要的是，μ-XRF 成像为策展人提供了一种用于退化 daguerreotype 的图像恢复方法，即使文物的状况超出了传统的保护处理。
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