Artefacts materiality

Solutions in contact with polyvinyl chloride can become contaminated with trace amounts of lead, titanium, tin, zinc, iron, magnesium or cadmium from additives used in the manufacture and moulding of PVC. V-Phenyl-2-naphthylamine is a contaminant of solvents and biological materials that have been in contact with black rubber or neoprene (in which it is used as an antioxidant). Although it was only an artefact of the separation procedure it has been isolated as an apparent component of vitamin K preparations, extracts of plant lipids, algae, livers, butter, eye tissue and kidney tissue [Brown Chem Br 3 524 1967]. 

The following is a summary of visual aids (slides, artefacts and demonstrations) that may be found helpful in presenting the material in this book. Material for slides may be found in this book in the further reading at the ends of the chapters and in other readily available sources (indicated by references [1] to [5] and listed at the end of Appendix 2). Where material for slides needs to be found from more specialised publications and reports we have given appropriate references. Copyright permission should, of course, be obtained where applicable. 

Artefacts Galvanised steel sheet, new and old anodised Al polymeric roofing material corroded exhaust system. 

Pottery is one of the oldest materials. Clay artefacts as old as the pyramids (5000 bc) are sophisticated in their manufacture and glazing and shards of pottery of much earlier date are known. Then, as now, the clay was mined from sites where weathering had deposited them, hydroplastieally formed, fired and then glazed. 

Cahn, R.W. (1992) Artifice and Artefacts 100 Essays in Materials Science (Institute of Physics Publishing, Bristol and Philadelphia) p. 314. 

Novel Methods for Making Carbon and Ceramic Materials and Artefacts... 

Novel methods for making carbon and ceramic materials and artefacts... 

Gays are an essential component of soils, to which we owe our survival, and they are also the raw materials for some of mankind s most ancient and essential artefacts pottery, bricks, tiles, etc. Clays are formed by the weathering and decomposition of igneous rocks and occur typically as very fine panicles e.g. kaolinite is formed as hexagonal plates of edge. 1-3 p m by the weathering of alkaline feldspar... 

Most examples of economic assessments in the corrosion literature are comparisons of similar artefacts in different materials, or of different protective schemes on the same artefact. The assessments in which a corrosion specialist is directly involved are usually of this type. The items concerned are well defined so that reliable costs can be sought, e.g. by quotations. 

Williams-Thorpe, O., S. E. Warren, and J. G. Nandis (1997), Characterization of obsidian sources and artefacts from central and eastern Europe, using instrumental neutron activation analysis, in Korek, J. (ed.), Proc. Int. Conf. Lithic Raw Material Characterization, Budapest and Siimeg, 1996, Budapest. 

In the present chapter, we first provide some general information concerning the chemistry of waxes and lipids currently encountered in various items from our cultural heritage and we detail the main protocols based on direct mass spectrometry that have been developed so far. We then discuss the mass spectra obtained by EI-MS on a range of reference substances and materials sampled from museum and archaeological artefacts. We then focus on the recent possibilities supplied by electrospray ionisation for the elucidation of the structure of biomarkers of beeswax and animal fats. 

Secondary ion mass spectrometry (SIMS) is a widespread analytical technique for the study of surfaces in materials science. Mostly used for elemental analyses and depth profiling, it is particularly relevant for many different fields of research including cultural heritage studies. Reviews of its use for the study of ancient glasses or metal artefacts already exist in the literature [Spoto 2000, Darque-Ceretti and Aucouturier 2004, Dowsett and Adriaens 2004, Adriens and Dowsett 2006, Anderle et al. 2006, McPhail 2006], but as only elemental information is obtained, these studies are limited to inorganic materials. 

Beside numerous applications for biological samples [Belu et al. 2003, Brunelle et al. 2005], studies of organic materials from cultural heritage artefacts have been developing since the beginning of the twenty-first century. In this review we show, through some selected examples, the different aspects and possibilities of ToF-SIMS analyses. 

ToF-SIMS is quite a new analytical tool for the study of organic materials from art and archaeological artefacts. Nevertheless, we will see that in the first published studies, its application can cover a great number of subjects and materials. 

Chapters 3 6 deal with direct mass spectrometric analysis highlighting the suitability of the various techniques in identifying organic materials using only a few micrograms of samples. Due to the intrinsic variability of artefacts produced in different places with more or less specific raw materials and technologies, complex spectra are acquired. Examples of chemometric methods such as principal components analysis (PCA) are thus discussed to extract spectral information for identifying materials. 

In this connection, it must also be borne in mind that the deoxyribonucleic acids subjected to analysis have probably not been homogeneous. Deoxyribonucleic acids have been fractionated by making use of their different solubilities in normal saline,186 by extracting thymus nucleo-his-tone with sodium chloride solutions of increasing concentration,187 by ion-exchange,187 and also by adsorption of the polynucleotide onto histone immobilized on a kieselguhr support.123 It is possible, however, that these are artefacts, since it has been shown that deoxyribonucleic acid fractions extracted from calf-thymus nucleohistone may or may not vary in composition according to the previous treatment of the material.188... 

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