Infrared Ellipsometry Analysis of Heritage Photographic Prints
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Focusing on the photographic archive of Julian Carrillo (Mexico), we study and characterize the photographic processes of a set of 13 photographs dated between 1884 and 1925. By using infrared spectroscopic ellipsometry, we classified a selected set of photographs according to its kind of binder. Thus, we recognized for each photograph, the presence of proteins, and therefore, the particular photographic process. Furthermore, we have identified the presence of baryta layer, the use of plasticizer, and the eventual coating utilized to protect the photograph, whose composition was based in natural organic components, mainly shellac, beeswax, or camphor. © 2018, © The International Institute for Conservation of Historic and Artistic Works 2018.
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binders; characterization; Ellipsometry; historic archive; photographic processes; photography Binders; Characterization; Ellipsometry; Spectroscopic ellipsometry; historic archive; Infrared ellipsometry; Infrared spectroscopic ellipsometry; Me-xico; Organic components; Photographic prints; Photography
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