By Howell G M Edwards; Peter Vandenabeele
Content material: advent; half I. ANALYTICAL tools: advent; equipment of Visualisation; Vibrational spectroscopy; X-Ray equipment; Nuclear recommendations; tools of separation; Mass spectrometry; Electrochemical recommendations; 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: id; Authentication; expertise of construction; Provenancing; courting; Degradation and conservation; nutritional reconstruction; precis; Index
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Generally, pigments in paintings do not benefit from NUV-induced fluorescence photography, as most NUV is absorbed in the top layer. This, however, offers possibilities to look at the preservation state of a painting and its varnish layer, which often represents itself by a bluish to greenish fluorescence. 60 In these cases, one should also use direct NIR or SWIR imaging, visible-induced NIR fluorescence (Figure 13C), microscopic examination and X-ray examinations (see later). Besides canvas paintings, NUV-induced fluorescence can be used to look at pigments in wall paintings and water-colour paintings or the investigation of dyed textiles.
First of all, it is best to remove the internal NIR-blocking filter. 10). Such a modification hugely increases the DSC’s sensitivity to NIR, while retaining the facility to view through the lens (impossible in the film-based approach of pure NIR imaging). 10 23 Modification of the digital imaging array by replacing the hot mirror. photography, in which case it becomes impossible to compose the image by looking through the viewfinder. 58,76 Moreover, because NIR radiation features longer wavelengths than visible light, the waves are less refracted and focus to another point which lies behind the visible focal plane.
13 29 Panchromatic (A), NUV|VIS fluorescence (B) and VIS|NIR fluorescence. Both fluorescence records reveal the restored areas clearly. (Reproduced from ref. 106 In most cases, however, fluorescence in the NIR is stimulated by blue-green visible light. Since it is known that materials such as leather, minerals, wood, natural resins and dyes can exhibit visible-induced NIR fluorescence,78 the technique has also been applied in cultural heritage imaging to a limited extent and can be used to examine the fake or altered state of the canvas.
Analytical Archaeometry by Howell G M Edwards; Peter Vandenabeele