A Mössbauer study of some coloured marbles (cipollino mandolato, rosso antico and fior di pesco): implications on the nature of their colour

⁵⁷Fe Mössbauer spectroscopy permits an explanation of the formation of the iron-bearing species present in three types of coloured marbles, known as cipollino mandolato, rosso antico and fior di pesco. Structural Fe²⁺ and Fe³⁺ located in silicates, together with the remains of weakly ferromagnetic hematite, arise from primary sediments. Fe²⁺ located in carbonates and anti-ferromagnetic hematite are formed by redox processes during marble formation. The relative contents of the iron species in the three types of marbles depend on the composition of the primary sediments and on local conditions during metamorphism. Knowledge of the type and amount of the iron species in marbles may help in the reconstruction of the redox processes, which took place during marble formation. The deviations of the Morin transition of the hematites play the role of genetic indicator because purity, crystallinity and the red hues of hematites in marbles can be related to the environment of formation.     

Trachytes employed for funerary artefacts in the Roman Colonies Regium Lepidi (Reggio Emilia) and Mutina (Modena) (Italy): provenance inferred by petrographic and chemical parameters and by magnetic susceptibility

Roman funerary artefacts belonging to the archaeological collections in Modena and Reggio Emilia, two important Roman colonies (Mutina and Regium Lepidi, respectively) in the Cispadane region (Northern Italy), are made of trachytes from the Euganean Hills, close to Padua. In particular, the petrographic and chemical parameters, besides magnetic susceptibility of archaeological trachytes, suggest Monte Oliveto as their main source; very few of them, however, come from Monte Rosso and Monte Merlo. Surprisingly the trachytes from Monselice, which were used extensively to get flagstones for paving the Roman roads of the Po plain, were not implied in funerary art. Possibly the porosity of stones was determinant in addressing the use of the Euganean trachytes: the stones from Monte Oliveto (and also from Monte Rosso and Monte Merlo), which contain frequent cavities and voids, are porous and might favour body decomposition, like important stones used in antiquity for sarcophagi (e.g. lapis sarcophagus). By contrast, the trachytes from Monselice are dense, not porous, hence harder and more resistant to abrasion, therefore suitable for flagstones.     

Creativity and Life Cycles of Artists

Age curves, which relate age to creativity or exceptional achievements, seem to take two forms: some artists bloom early (Picasso), others later in life (Cézanne). We argue that this objective fact is not related to their mode of creation according to which some artists proceed by drawings made prior to the painting's execution, while others are more likely to imitate and achieve this through color and the process of painting itself. JEL numbers:Z10,Z11A very preliminary version of this paper was presented as a discussion at the conference Measuring Art: A Scientific Revolution in Art History, University of Chicago and American University of Paris, June 2003.     

The Russian avant-garde painting palette: Documentary and physicochemical codification of organic colorants

In the present article an attempt is made to elucidate the organic colorants commonly encountered in the Russian avant-garde painting palette by a combined art historical, documentary and physicochemical investigation, and to examine the influence of environmental factors on the chromatic profile originally sought by the artist. The overall approach based on written sources is confirmed by measurements on relevant paintings. The documentary research deals with the influences of Orthodox iconography, folkloric art, and occidental modernist tendencies on the Russian avant-garde palette, and studies the effects of contradictory historical processes in the chromatic profile of individual paintings. In the experimental section a series of colorants are investigated concerning the effects of accelerated ageing on experimental painting tables, prepared as watercolor and gouache layers on paper ground. The resulting samples are subjected to colorimetric and spectroscopic measurements, and analogous analytical procedures are applied on samples taken from selected paintings. A systematic comparative study of all data permits evaluation of the materials used in terms of their stability towards extrinsic factors, and proposal of degradation routes in order to assist museum curators and conservators in every concrete case related to the broad spectrum of pigments examined.     

Failure to meet the reserve price: the impact on returns to art

This article presents an empirical study of paintings that have failed to meet their reserve price at auction. In the art trade, it is often claimed that when an advertised item goes unsold at auction, it will sell for less in the future. We have constructed a new dataset specifically for the purpose of testing this proposition. To preview our results, we find that paintings which come to auction and failed return significantly less when they are eventually sold than those paintings that have not been advertised at auction between sales. These lower returns may occur because of common value effects, idiosyncratic downward trends in tastes, or changes in the seller’s reserve price.

How should cultural diversity be measured? An application using the French publishing industry

Despite the lack of a clear definition of the concept, “cultural diversity” has remained a core issue for more than a decade (WTO, UNESCO, etc.). The aim of this paper is to begin to fill this gap. We argue that cultural diversity is a multi-dimensional concept and that accurate metrics must rely on three criteria: variety, balance and disparity. We also stress that supplied and consumed diversity have to be distinguished. We apply this set of multiple measures of diversity to publishing data for France over the period 1990–2003. Our main result is that the situation of the publishing industry in terms of cultural diversity is highly dependent on the dimension considered. Hence, diversity increases when variety is the sole consideration, whereas taking balance or disparity into account leads to the opposite conclusion. This issue raises a series of questions about the use of diversity measures in a policy debate concerned with furthering cultural diversity.

The binding media of the polychromy of Qin Shihuang's Terracotta Army

The “Terracotta Army” is a worldwide known archaeological finding in China. It is a part of the burial complex of the emperor Qin Shihuangdi (259–210 BC), which is still under excavation and study. The fact that the sculptures, chariots and weapons of the First Chinese Emperor's Terracotta Army were originally all painted in bright colours is still not widely known. The chemical characterisation of the paint medium was performed through an analytical procedure based on GC-MS. The proteinaceous binder was identified for the first time through a desalting procedure used in proteomics. The identification of egg as a paint binder is extremely interesting in terms of the historical significance of the work of art itself and important in terms of the method of conservation. Moreover it represents one of the first steps towards an understanding of the painting technique used on ancient sculptures in China, of which – despite their fame – nothing is yet known.     

Deacidification of paper using dispersions of Ca(OH)2 nanoparticles in isopropanol. Study of efficiency

The efficiency of a recently described non-aqueous method for paper deacidification using Ca(OH)₂ nanoparticles in isopropanol was evaluated by pH and colorimetric measurements and by the analysis of the degree of polymerization (DP). Samples of plain paper and paper with iron gall ink were tested. The results were compared with non treated samples and samples submitted to the traditional treatment with saturated aqueous Ca(OH)₂ solution. By comparing the two conservation methods, the aqueous one shows higher neutralization reaction kinetics than the non-aqueous one. The iron gall ink samples maintain their coloration closer to the original after the non-aqueous Ca(OH)₂ nanoparticles treatment, in contrary to the aqueous treatment that changes the ink aesthetics considerably. Artificial aging tests revealed a general increase in the aging stability of deacidified paper samples. The Ca(OH)₂ nanoparticles treatment can be an alternative for papers who can not be treated by the classical aqueous treatment, e.g. papers with water soluble components.     

The presence of trapped carbon dioxide in lapis lazuli and its potential use in geo-sourcing natural ultramarine pigment

The source of the previously unassigned weak band at 2340 cm⁻¹ that is occasionally observed in the infrared spectrum of natural lapis lazuli pigment is here attributed conclusively to CO₂ trapped in the β-cage of lazurite. In addition, the geo-sourcing potential of this infrared feature for lapis lazuli is tested and found to be more ambiguous than previously suggested. The CO₂ absorption band is in fact observed in lapis lazuli samples from numerous disparate geographic locales including Afghanistan, Canada, Myanmar, Siberia, Tajikistan, and the Ural Mountains, as well as mineral hauyne samples from Germany and Italy. The spectral feature was absent from lapis lazuli samples from California, Chile, Colorado, and New York. Furthermore, poor quality lapis lazuli samples, regardless of locale, highly processed natural pigment samples, and all samples of synthetic ultramarine blue, green, and violet pigments were devoid of encapsulated CO₂.     

Competing Quality Conventions in the French Online Display Advertising Market

This paper builds upon an empirical study of suppliers of online advertising space in France in order to highlight the plurality of quality conventions that organize the activity of market intermediaries. We show that the market is organized around two different quality conventions, the ‘media’ convention and the ‘direct-response’ convention, each equipped with specific efficiency indicators, pricing methods and selling channels. Then we focus on the growing conflict of territory between the two conventions; we analyse the balance of power between the conventions and the arenas where they compete. We observe that the collective action of the defenders of the traditional world is not (yet) sufficient to contain the pervasiveness of the indicators and metrics from the world of direct-response.     

Understanding Hollywood's organization and continuing success

Integrated international marketing of films and related merchandise and close financial ties between distributors and roducers have evolved to cope with the risks of piracy, cost containment, opportunism, and revenue uncertainty. Our reading of the evidence is that this system has dominated because of its efficiency. In search of an explanation of why America remains the centre of this institutional and contractual web, we examine the impact of two world wars, the rapid commercialization of new technologies in the United States by aggressive managers, an open financial system and the ethnic diversity, language homogeneity, and size of the domestic market.We are grateful to Elizabet Filleul, Simon Grant, Peter Harcourt, Ian Jarvie and Janet Staiger for their comments but absolve them of any responsibility for the views presented.     

Lime render layers: An overview of their properties

Lime renders are of great importance not only to enhance the appearance of the buildings, but also to protect and preserve old masonries. They constitute a specialized system, composed of several layers, in which each of them depends on the others and carries out some specific functions in order to assure a suitable performance of the whole. Knowledge of the traditional materials and techniques, as well as the know-how, is one of the key points in the maintenance and conservation of lime renders and, by extension, of our Heritage. However, the promotion of the use of cement and the industrialization process, which in the case of Spain took place about the 1960's, caused lime mortars to fall into disuse. In this article, classical treatises as well as the state-of-the-art researches were analysed to compile the properties of lime render layers, on the whole. The knowledge of these characteristics is essential to maintain and repair the existing renders as well as to formulate new compatible ones, while assuring their durability and appropriate performance. Lime is the selected binder for these recommendations because it was widely used as drawn from the literature.     

First experiments for the use of microblasting technique with powdered cellulose as a new tool for dry cleaning artworks on paper

This research evaluates the use of microblasting technique with powdered cellulose as a new tool for dry cleaning documents. Different cleaning tests were conducted on three documents with different properties following this new approach and the results were compared to those obtained with traditional dry cleaning with erasers. In order to assess changes caused to the supports, the treated documents were examined both before and after cleaning with optical and 3D stereomicroscopy, SEM-EDS and spectrophotometry. The results allow the conclusion that microblasting with powdered cellulose is a feasible technique to remove surface dirt or grime on paper documents. This research proves that the new use of the technique does not entail changes to the surface properties of the treated supports. Moreover, powdered cellulose is chemically stable and compatible with paper documents, preventing negative long-term effects derived from the presence of rubber residues that may remain in paper fibres when using erasers in dry cleaning treatments.     

The Frozen Archive,or Defrosting Derrida

What does freezing human tissue and fluids, or human remains, do to the mobility, temporality, and value of such objects? While Jacques Derrida toward the end of his life considered the consequences for the remainder of burial and cremation, he did not consider freezing, the production of latent or interrupted life. Here I invoke Derrida in discussion of how in the investigation of the fatal brain disease kuru, the partible tissues of the Fore people of Papua New Guinea became frozen spectral commodities in the exchange regimes of modern biomedical science – and how they gained, or retained, value as they were objectified. I follow these Fore – or kuru – valuables into the frozen archive, asking what has become of the remainder, whether it now amounts to anything more than defrosting debris among the postcolonial ruins. I ask what is the value of latent life? Or, rather, who is the value of latent life? This essay therefore serves as a supplement to more economistic estimates of biovalue.     

Euganean trachytes: discrimination of quarried sites by petrographic and chemical parameters and by magnetic susceptibility and its bearing on the provenance of stones of ancient artefacts

This paper reports petrographic and chemical data and magnetic susceptibility values for trachytes of quarries recognizable within the Euganean Hills and sets out diagnostic parameters for these rocks. The diagnostic scheme proposed is basic for the definition of provenance of trachytes used in ancient artefacts spread over northern Italy. Trachytes were extensively used by the Romans for paving Via Aemilia, the most important road in the Po Plains connecting Ariminum (present-day Rimini on the Adriatic sea) to Placentia (present-day Piacenza on the Po river). Remains of the trachytic flagstones (basoli) used for paving segments of Via Aemilia crossing Regium Lepidi (present-day Reggio Emilia) and Bononia (present-day Bologna) have been characterised petrographically, chemically and also using magnetic susceptibility data. The discriminating scheme proposed here for the Euganean trachytes has been applied to the data obtained for basoli and thus the provenance of each investigated block has been inferred. The rocks sampled at Regium Lepidi mostly come from Monselice (only a few blocks from Monte Oliveto and Monte Merlo) and those of Bononia come mostly from Monte Merlo and, subordinately, from Monte Oliveto and Monselice (only one sample from Monte San Daniele). The dominant provenance of blocks, which is different in the two colonies distant by less than 50 km, suggests that the two segments of Via Aemilia were not built simultaneously.     

Governmental Conditions for the Economization of Uncertainty

The central place occupied by actuarial calculation in insurance is usually understood as resulting from the process of bringing the laws of large numbers to bear on archival data in terms of an ‘insurance imaginary’. However, little attention is paid to the political and broader governmental conditions upon which actuarialism rests. Analysis of fire insurance in Australia indicates that despite urgings from other branches of insurance, the industry did not go down this ‘scientific’ track until well into the twentieth century. Instead, it relied on detailed individual inspection by insurance agents and a process of ‘cumulative dangerousness’ – adding up the multiple hazards discovered in each case and using this as a guide to setting premiums. The result was slow, expensive and cumbersome. But the industry was forced to adopt this approach because the built environment in Australian cities was so underregulated that nothing could be taken for granted. Only when adequately designed and enforced government regulations began to appear after the mid-1920s could fire insurance adopt actuarial techniques for economising uncertainty.     

Neoliberalism and Natural Disaster

A substantial recent literature has examined insurance as a mechanism for economizing uncertain but potentially catastrophic events. Less attention has been paid to how insurantial techniques for economizing catastrophe have been deployed as political technologies. Focusing on discussions of US flood policy in the 1960s, the present article examines how insurance was used to forge new articulations and accommodations between political government and processes of rationalization. On the one hand, insurance provided a technical solution to problems that had long confronted US policy-makers: How to reduce losses from floods? How to fully compensate individuals who suffered losses? On the other hand, insurance was a device for reshaping the aims and objects of government, and for reframing questions that are more frequently situated at the level of political philosophy: What are the respective responsibilities of individual citizens and government in providing security? What tradeoffs must be made between the provision of security and economic rationality? What values are relevant in orienting public policy? In examining these issues, the article raises questions about standard narratives about the changing relations among risk, responsibility, and security in recent decades, particularly as they relate to neoliberalism.     

Power and Performativity in the Creation of the UK Fishing-Rights Market

Judith Butler's work on performativity takes an explicitly Foucauldian approach to politics. The economic performativity literature, in comparison, has been criticised for failing to foreground power. This paper uses a case study of market creation in UK marine fisheries to suggest, after Butler, ways in which a Foucauldian analysis of the exercise of power can inform our understanding of economic performativity.     

Ettringite and thaumasite: A chemical route for their removal from cementious artefacts

The present paper reports a new method for converting ettringite and thaumasite in non-expansible and insoluble phases, for its application in the restoration of concrete artefacts subjected to deterioration through sulphate attack. The salts were synthesized by different processes and, after characterization by means of XRD, FT-IR and optical microscopy, were treated with a series of chemicals in order to induce their decomposition. In particular, different solutions containing barium nitrate, barium hydroxide and ammonium oxalate were used to achieve the complete transformation of both phases in barite, witherite, scarbroite and whewellite. Barium hydroxide seemed to be the most appropriate reactant because the others could give rise to efflorescence within the pores of the mortars by leaving free nitrate or sulphate ions inside the materials. The experimental technique was also tested on two concrete samples collected from the bell-tower of St. Nicholas’ Cathedral in Nicosia (Sicily) with encouraging results.     

‘Partnership’ in Action: Contagious Abortion and the Governance of Livestock Disease in Britain, 1885–1921

Most histories of livestock disease in Britain treat the development of control policy as a government responsibility, to which farmers made little constructive contribution. Similarly, farmers rarely appear in accounts of disease research. This paper uses the example of contagious abortion (brucellosis) at the turn of the twentieth century to reveal that state-farming collaboration in research and policy did in fact occur, and that it operated in various ways, with often unexpected outcomes. The collaborative approach to contagious abortion is partly attributed to its clinical and epidemiological features, which made it an unsuitable candidate for the existing, state-led policy of stamping out disease. It is claimed that such collaboration has been overlooked by historians on account of their focus upon diseases that were amenable to stamping out. This focus needs to change if history is to inform present-day disease governance in Britain, which is founded on the concept of ‘partnership’ between farmers and the state.