69 research outputs found
"Live” Prussian blue fading by time-resolved X-ray absorption spectroscopy
Prussian blue (PB) is an artists' pigment that has been frequently used in many artworks but poses several problems of conservation because of its fading under light and anoxia treatment. PB fading is due to the reduction of iron(III) into iron(II) and depends a lot on the object investigated. Due to the complexity of the structure, the precise physico-chemical mechanisms behind the redox process remain obscure. In this paper, we present a procedure to investigate light- and anoxia-induced fading of PB-paper samples by means of time resolved X-ray absorption spectroscopy performed at the Fe K-edge. A system composed of a visible light source and a flux-controlled environmental cell allowed light, gas and humidity to be modified in situ. The synchrotron X-ray beam was evidenced to induce a reduction of PB and to play a major role in the kinetics. The analysis of the PB fading kinetics of a sample submitted to various gas and light environments showed that both synchrotron beam and anoxia were influencing PB reduction in a correlated way. In comparison, light was found to play a minor role. Finally, we have demonstrated that the type of paper substrate could influence significantly the kinetics of reduction. Several hypotheses to explain the correlation between PB reduction mechanism and substrate are presente
A Study of Cathodoluminescence and Trace Element Compositional Zoning in Natural Quartz from Volcanic Rocks: Mapping Titanium Content in Quartz
Determining the Local Bulk Chemistry of Martian Aqueous Alteration via X-ray Spectrum Imaging: A Link to Global Dust on Mars?
Determination of Major, Minor, and Trace Elements in Jadeite using Scanning micro-X-ray Fluorescence
MOESM1 of Optimizing compositional images of daguerreotype photographs using post processing methods
Additional file 1. The original, unaltered Au-Hg Mα image from the “Two Boys” daguerreotype saved as a .tif file
Examination of Heritage and Geological Materials Using Correlated Electron- and X-ray-Beam Microanalysis in the SEM
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