Figure 2 | Scientific Reports

Figure 2

From: Recovery of Degraded-Beyond-Recognition 19th Century Daguerreotypes with Rapid High Dynamic Range Elemental X-ray Fluorescence Imaging of Mercury L Emission

Figure 2

(A) An optical image of plate from a 19th century daguerreotype from the National Gallery of Canada Study Collection. Optical image illustrates the effects of the use of chemical cleaning. The left half of the plate has been cleaned with a 1% NH4OH for 30 minutes. A small circular area produced by electrocleaning is visible on the optical image in the top left hand corner of the plate. These are preliminary and inconclusive conservation efforts; further investigation is required. (B–F) μ-XRF images of Hg (Lα), Au (Lα), Ag (Lα), Fe (Kα), and Cu (Kα) distributions collected at Cornell High Energy Synchrotron Source (CHESS). Micro-XRF maps for Hg collected at an incident energy of 13025 eV, a pixel size of 20 × 20 μm, and a working distance of 2 mm.

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