Analytical Archaeometry by Howell G M Edwards; Peter Vandenabeele

By Howell G M Edwards; Peter Vandenabeele

Content material: creation; half I. ANALYTICAL equipment: advent; equipment of Visualisation; Vibrational spectroscopy; X-Ray equipment; Nuclear concepts; tools of separation; Mass spectrometry; Electrochemical thoughts; half II. fabrics: Ceramics and enamels; Glass; Stone; Gemstones/minerals; Obsidian; Pigments and dyes; Icons and work; Metals / corrosion; Biomaterials; Resins, bitumens, tar, coal; Ivory and bones; wooden; Textiles; modern fabrics; half III: QUESTIONS: identity; Authentication; expertise of creation; Provenancing; relationship; Degradation and conservation; nutritional reconstruction; precis; Index

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Iron gall inks absorb NUV quite well, while the paper background fluoresces under NUV illumination. Broadband visible imaging can pick up the fluorescence and significantly improve the documents’ legibility. 61 In accordance with principles of NUV-induced fluorescence, visible-induced fluorescence photography records radiation emitted by the subject under study mostly in the NIR region (although the red part of the visible region is also possible). However, an object can also emit NIR radiation around 1000 nm while being illuminated with shorter, more energetic NIR wavelengths ranging from 750 nm to 850 nm.

However, studio light will be required in most imaging situations. Ideally, this studio light should only produce NUV (also called UV-A or Long Wave UV) radiation. g. the popular tubular Philips TL-D 36 W BLB SLV lamps), Xenon arcs lamps (such as those of electronic flashes), lasers and metal halide lamps (consider ref. 60 for a thorough overview). Most of them are quite compact, stable and have a constant output. Very convenient are the electronic flash lamps used for conventional visible photography.

G. the popular tubular Philips TL-D 36 W BLB SLV lamps), Xenon arcs lamps (such as those of electronic flashes), lasers and metal halide lamps (consider ref. 60 for a thorough overview). Most of them are quite compact, stable and have a constant output. Very convenient are the electronic flash lamps used for conventional visible photography. Depending on the gas mixture they contain, these flash lights can have a quite intense output in the NUV region. 60 Commercially available Methods of Visualisation 21 continuous Xenon lamps such as the Polilight PL500 are also very good solutions, although they are expensive and less efficient than many other sources.

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