By Philip Grierson
In quantity 2 of this sequence, half I examines Phocas and Heraclius (602-641) and half II covers the interval among Heraclius Constantine to Theodosius III (602-717).
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Extra info for Catalogue of the Byzantine Coins in the Dumbarton Oaks Collection and in the Whittemore Collection, 2: Phocas to Theodosius III, 602-717 (Dumbarton Oaks Catalogues)
Papers may have surface coatings to provide a good surface for printing, to texture them or may have a layer of adhesive. Thick sheets of paper can be formed by casting a lot of fibres onto the web or laminating thinner papers together with adhesives to form cardboard. Some papers are dyed, waterproofed, fireproofed or perfumed. Paper is the support for photographs and can be made into books and magazines, or can be made into all manner of objects, including boxes. Paper with printing, drawing or painting on it and paper constructions are much more complicated than just a sheet of paper and any ageing and conservation process of a sheet of paper will be influenced by the media on the surface and vice versa.
WDS information is collected with a specific crystal detector that is rotated through the range where each specific element’s diffraction wavelength is found. Different crystals are also used for different wavelength ranges and the geometry of the primary beam, sample and crystal are important for proper detection and collection of the information. WDS is much slower than EDS, but is generally one order of magnitude more sensitive than EDS. As a result, both techniques can nicely complement each other, as they have different Methods in Conservation 23 Figure 8 SEM and dot mapping of inclusions in glass strengths and weaknesses, to produce a more accurate composition of the sample.
The conservator may take care to use similar papers that have been stored for some time, align the MDs and avoid getting the paper too wet if using a waterbased adhesive. 4 DETERIORATION OF PAPER Paper objects may suffer from damage by vermin, insect and microbial attack, theft, fire and flood. However, from a chemist’s point of view there are two important mechanisms by which paper deteriorates, both of which may change its hue and make it weaker; these mechanisms are acid-catalysed hydrolysis and oxidation.