SCIENTIFIC ANALYSIS OF SEVENTH‐CENTURY GLASS FRAGMENTS FROM THE CRYPTA BALBI IN ROME*

Inductively coupled plasma emission spectroscopy, reflectance spectroscopy and X‐ray diffraction were used to study seventh‐century AD glass fragments from the Crypta Balbi in Rome. All the samples were found to be silica‐soda‐lime glasses. Iron determines the colour of blue‐green, green and yellow‐green transparent glasses; chemical composition suggests deliberate addition of iron and/or manganese in about half the samples. Copper was found as the main colourant in red, pale blue and blue‐green opaque fragments; elemental copper acts as an opacifier in red glass, and calcium antimonate in white, pale blue and blue‐green glasses. Detection of antimony in transparent fragments suggests recycling of opaque mosaic tesserae.     

Identification of pigments used in rock art paintings in Gode Roriso-Ethiopia using Micro-Raman spectroscopy

In this paper we present results on the rock art painting materials from the Gode Roriso rock shelter, located in the eastern Hararghe region of Ethiopia. This analysis included X-microfluorescence, Micro-Raman spectroscopy and microstratigraphy. As far as the results of the analysis are concerned, a white natural wax (beeswax), carbon black and iron oxides (a mixture of haematite and magnetite) along with charcoal particles (forming as a red colourant) have been applied on a natural substrate constituted of granite containing feldspar crystalline forms. Although very much a science-based piece of research, the results have far-reaching outcomes for understanding the sequencing of pigment application.     

Cutmarks on Capsian human remains: implications for Maghreb Holocene social organization and palaeoeconomy

In 1930, the remains of five adults, one subadult, and one infant were excavated from Site 12, a ca. 8000 bp Capsian escargotière in Algeria. Recently, cutmarks were found on several postcranial bones of each of the adult individuals. In an attempt to reconstruct the burial circumstances, archival materials including photographs and field notes were retrieved from the State Historical Society of Wisconsin and the Logan Museum at Beloit College, and a detailed study of the cutmarks was carried out. The cutmarks are associated mostly with long bones and skulls, while two individuals show cutmarks on the thorax. Using theories relating secondary burial practices to a nomadic lifestyle, it is hypothesized that the individuals died away from camp. Initial preparations, while awaiting transport to Site 12, involved limited exposure, followed by decapitation, dismemberment, and possibly defleshing of the thorax and removal of the internal organs. At Site 12, a formal burial ceremony was conducted during which red ochre was used. In some cases the dismembered extremities were placed in the grave with the rest of the body, but several skulls and long bones are missing. It is not known what the missing bones were used for, although Capsian groups are known for modifying human bones for either utilitarian or ritual purposes. This is the first time that cutmarks on human remains are reported for this area and period. The idea that Capsian people practiced decapitation and dismemberment has been suggested before, based on observations on other sites, however. Studies of human skeletal material from the Maghreb, often excavated decades ago, may therefore reveal similar types of evidence. It is suggested that such studies will contribute significantly to our understanding of Holocene Maghreb burial practices, and our ability to reconstruct social organization and palaeoeconomy. Copyright © 1999 John Wiley & Sons, Ltd.     

Metallurgical Characterization of A Coated Roman Iron Coin By Analytical Investigations

A coated Roman iron coin from Villa Loig in Salzburg, Austria was investigated. The coating is a copper alloy consisting of Cu, Pb, Sn, Zn and negligible amounts of Ag, a variant of gunmetal known as ‘leaded red brass’. The numismatic term for such a coin is subferratus (Latin). From an archaeometallurgical point of view, information about the chemical composition, the microstructure and the manufacturing technique are of interest. To achieve these objectives, different analytical techniques and metallographic examinations were applied. Droplet‐shaped iron inclusions were observed in the red brass coating, while at the grain boundaries, inside the iron core, copper and lead were detected (liquid metal embrittlement). The dendritic microstructure of the coating, the spheroidal‐shaped iron inclusions in the coating and the liquid metal embrittlement show that the iron coin was plated by immersing it in a molten copper alloy. The iron core is a low‐carbon steel with slag stringers, both of which are characteristic of a bloomery iron. Deformation twins (Neumann lines) were observed in the microstructure of the iron core and indicate that the coining was performed after the flan was cooled.     

Rats cannot have been intermediate hosts for Yersinia pestis during medieval plague epidemics in Northern Europe

The commonly accepted understanding of modern human plague epidemics has been that plague is a disease of rodents that is transmitted to humans from black rats, with rat fleas as vectors. Historians have assumed that this transmission model is also valid for the Black Death and later medieval plague epidemics in Europe. Here we examine information on the geographical distribution and population density of the black rat (Rattus rattus) in Norway and other Nordic countries in medieval times. The study is based on older zoological literature and on bone samples from archaeological excavations. Only a few of the archaeological finds from medieval harbour towns in Norway contain rat bones. There are no finds of black rats from the many archaeological excavations in rural areas or from the inland town of Hamar. These results show that it is extremely unlikely that rats accounted for the spread of plague to rural areas in Norway. Archaeological evidence from other Nordic countries indicates that rats were uncommon there too, and were therefore unlikely to be responsible for the dissemination of human plague. We hypothesize that the mode of transmission during the historical plague epidemics was from human to human via an insect ectoparasite vector.     

Red ochre decorations in Spanish Neolithic ceramics: a mineralogical and technological study

Some Neolithic ceramics from south-eastern Spain have red to brown external decorations called “almagras” (red ochre). The pigment layer is essentially composed of a mixture of clay and iron oxides: haematite (red) and maghemite (brown). It is suggested that maghemite was formed during the firing process of ceramic in a reducing atmosphere. Several laboratory tests have been carried out to obtain maghemite by adding charcoal or pinewood sawdust to similar ceramic pastes. In fact, maghemite was formed, even when the piece was simply covered with pinewood sawdust before firing. The diverse original red colours are due to variations in iron oxide (or calcite) content and to redox conditions in the firing procedure. Brown- coloured ceramics owe their colour to maghemite and must be considered as a “fabrication defect”, due to the position of the ceramic piece in a zone where a reducing atmosphere prevailed in the course of firing.     

浙江松阳出土南宋剔犀漆器的制作工艺及材质的研究

为了研究中国古代漆器的髹漆工艺并为漆器的保护修复提供相应的科学依据,本研究通过显微镜、显微红外光谱、扫描电镜、X射线荧光光谱、显微激光拉曼光谱等方法对浙江松阳出土南宋剔犀漆器残样的制作工艺和材质进行了研究分析。分析结果说明该漆器采用杉木作为漆胎,并在其上涂刷了以高岭土(AL2_O_3·2SiO_2·2H_2O)与动物毛发为主要成分的胎地填料(底灰)。然后分别在器物内外表面上髹饰上调制而成黑色和红色的天然生漆。将外表面红色漆膜雕刻成如意云纹,并在云纹边缘描绘黑漆线作为修饰,最后再在其上髹饰一层红色面漆。漆器红漆和黑漆层由同种天然生漆髹漆而成,但是两者采用的颜料分别为HgS和含Fe的黑色颜料。     

Red abalone collecting and marine water temperature during the Middle Holocene occupation of Santa Cruz Island,California

Oxygen isotope values derived from prehistoric mussel (Mytilus californianus) shell calcite are used to determine whether sea-surface temperatures in the vicinity of the Punta Arena site (CA-SCRI-109) on Santa Cruz Island, California, were cooler than present between 6300 and 5300 cal BP. This site and others in the western sector of the island dating to this period are distinctive because of the presence of large red abalone (Haliotis rufescens) shells, a species that historically has been subtidal around Santa Cruz and the other northern Channel Islands. Comparison of temperature values derived from archaeological shells with those from modern mussel shells, along with water temperatures derived from satellites, indicates that waters were cooler during the 6300 to 5300 cal BP period. These results are consistent with a previous study and support the interpretation that collection of red abalone during the 6300–5300 cal BP period was partly the result of cooler water temperatures that made this large mollusk more available to foragers in the intertidal or shallow subtidal zone.     

Chemical composition and colouring agents of Roman mosaic and millefiori glass, studied by electron microprobe analysis and Raman microspectroscopy

About 100 fragments of Roman mosaic and millefiori glass were stylistically attributed to a Hellenistic type, a Ptolemaic and Romano-Egyptian period type and an early imperial period type. Twelve representative fragments were studied by electron microprobe analysis and Raman microspectroscopy. Eleven of them display a Na-pronounced recipe with low K, Mg and P contents, typical for the Roman period. Minor differences in composition are unsystematic, not reflecting the stylistic classification. Ionic colouring agents are Mn³⁺ for violet, Cu²⁺ for light blue, Co²⁺ for deep blue and Fe³⁺ for brown translucent colours. Calcium antimonates, lead antimonate and cuprite are the colourants responsible for white, yellow and red colours, respectively, and additionally serve as opacifiers. Mixing of ionic colouring agents and opacifying colourants led to a more differentiated palette of colours. Pb was used as yellow colouring agent, as a flux material and as a stabiliser for the colourant crystals. The remaining fragment consisting of a K-pronounced but still Na-bearing glass matrix was most likely produced during the Middle Ages or later.     

甘肃拉卜楞寺壁画表面涂层材质分析

西藏壁画表面大多刷有保护涂层。据记载,其材质主要是桐油、牛胶或清漆等。但目前,对该涂层材质科学的研究却较少,不利于后期保护修复。为配合拉卜楞寺壁画保护修复项目,本研究以衰减全反射红外光谱法(ATR-FTIR)、核磁共振氢谱法(~1H-NMR)、热裂解-气相色谱-质谱联用(Py-GC-MS)技术等分析手段,对甘肃夏河拉卜楞寺弥勒佛殿、时轮学院主殿壁画的涂层进行了分析。结果表明,两处佛殿壁画涂层可确定是一种干性油,种类与桐油较接近。但由于西藏壁画在材料和工艺上的独特性,材料老化等因素,拉卜楞寺壁画涂层在组成和结构上,与现代桐油有一定差别,表现出一定的丰富性和复杂性。后期修复,可采用性质与西藏传统涂层材料接近的干性油,例如桐油,作为新的壁画表面涂层材料。     

Examination of some pigments,grounds and media from Egyptian cartonnage fragments in the Petrie Museum,University College London

A number of cartonnage fragments from the collections of the Petrie Museum, UCL, were examined to identify pigments, media and grounds. The different types of cartonnage made in ancient Egypt are reviewed. Special attention was paid to green pigments, which were shown to be of green earth, or a mixture of Egyptian blue and a yellow, usually goethite or orpiment. Green earth was found in one artefact, dated to the 9th century BC: all other examples were from the Graeco-Roman period. No copper-organometallic greens were present in the examples studied, or Egyptian green, or malachite. Binding media was identified both by ELISA and by GC/MS. A pink colourant was identified as madder, while lead white was used as a white in one example, showing the influence of Roman and Greek pigments on Egyptian art in these later periods. Plant gum, egg, and animal glue were found in different fragments, with mixed media in a few cases. Moganite was found associated with quartz in some preparatory layers by X-ray diffraction, which has not been reported previously as a constituent of ground layers in Egyptian artefacts.     

Boat-based foraging and discontinuous prehistoric red abalone exploitation along the California coast

Temporally and spatially discontinuous pulses of heavy prehistoric exploitation of red abalone (Haliotis rufescens) have been documented along the southern and central California coast. This article examines the very late (post-950 cal BP) appearance of numerous red abalone processing sites on the Monterey Peninsula in central California. We test three prominent explanations offered for the sudden onset of red abalone processing sites: trophic cascades resulting from human predation on sea otters, logistical foraging by inland residents, and changes in sea surface temperature. A trophic cascade appears to have occurred but does not fully explain the nature or timing of the phenomenon in the region.     

Ceramic findings from the archaeological site at Aiano-Torraccia di Chiusi (Siena,Italy): a multi-analytical approach

In 2005, the remains of a Roman villa, dating from the early fourth to the sixth centuries ad, were discovered at the archaeological site of Aiano-Torraccia di Chiusi (Siena, Italy). After being abandoned in the sixth century ad, the complex was occupied by a group of Ostrogothic or Lombardic artisans in the period between the sixth and the seventh centuries ad. Many ceramic remains (coarse pottery and red slip ceramics) from the first to the seventh centuries ad have been discovered on this archaeological site. These findings have been analysed using different analytical techniques (optical microscopy (OM), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscope-energy dispersive spectroscopy (SEM-EDS), attenuated total reflection Fourier transform infrared (ATR-FTIR), and micro-Raman in order to characterize the ceramic body, the coating, the temper, and to investigate the compositional relationship between the different kinds of ceramics. The use of different techniques on the same samples yielded information at different scales. OM and SEM-EDS yielded interesting information on the coarse pottery: the analyses performed on some minerals and rock fragments suggest that stone tesserae from the Roman villa (in the form of numerous marble fragments) were used in the production of this pottery. Bulk analyses (XRD and XRF) and subsequent micro-analyses (SEM-EDS, ATR-FTIR, and micro-Raman) of the red slip pottery revealed clear chemical, mineralogical and textural differences: some ceramics (the TCC sample group) typically have a Fe-enriched coating while others (the INGR sample group) present a clear difference in grain size but no chemical or mineralogical differences between the ceramic body and the coating.     

Black grouse as the prey of the golden eagle at an archaeological site

Remains of black grouse, Lyrurus tetrix, were recovered from an archaeological excavation of the site of a golden eagle, Aquila chrysaetos, eyrie. It has been suggested that bird remains from human predation can be distinguished from those due to avian predation, because humans leave few of the distal bones (tibiotarsus, carpometacarpus). In this case, the eagle also left few of these bones; it is suggested that the distinction is one which may allow owl prey to be distinguished, but human and raptor prey are indistinguishable by that criterion.     

汉阳陵文物彩绘的结构观察及颜料成分分析

汉阳陵彩绘文物多种多样,出土时有些保存状态良好,受环境影响较小,而有些则相反。为了弄清其内部结构原因,为文物保护提供科学依据,通过显微镜观察、X-衍射分析并结合相关文献对4类彩绘文物进行了研究。研究结果表明:(1)著衣式陶俑彩绘只有一层颜料层;陶器和木马彩绘由三层构成:灰腻层、生漆有机层、颜料层;(2)漆器彩绘由2~3层漆灰-亚麻布+2层以上生漆+2~3层色漆构成;(3)陶俑和木马上的红色颜料为铁红;漆器的红色颜料是朱砂。研究建议出土时对具有生漆有机底层的彩绘即刻采取保湿措施,并采用防绉缩和加固并用的保护方法。     

Analytical characterization of lacquer objects excavated from a Chu tomb in China

This work presents the results of an investigation of the lacquer objects excavated from a Chu tomb in China (Warring States, 481–221 BC). This study is engaged in the examination of the methods and the materials used for the urushi coating on the objects. X-Ray fluorescence and Scanning Electron Microscopy/Energy Dispersive Using X-Ray (SEM/EDX) analyses were applied for the pigment identification. The results show that vermilion was for the red colour, while carbon black was for the black colour. Pyrolysis gas chromatography and mass spectrometry (Py-GC/MS) was applied for the characterization of the lacquer resulting that it is based on urushi. The possibility to classify the drying oil (tung or linseed oil) present in the lacquer is highlighted and discussed in this paper. Py-GC/MS with in-situ hydrolysis and methylation reagent tetramethylammonium hydroxide (TMAH) were performed on reference materials of linseed oil and tung oil as well as on the lacquer object samples. The results show that it is possible to unambiguously identify the drying oil, in our case, linseed oil was identified to retard the rate of hardening.     

Provenance of Red‐Figure Pottery of the Classical Period Excavated at Olympia

Neutron activation analysis (NAA) has been applied to a set of red‐figure pottery fragments excavated in Olympia, in Elis: (a) to determine the provenance of these vases, since this is difficult by archaeological means, and the vessels might be local Elean or Attic, Corinthian or Italian products; and (b) to determine the characteristic elemental pattern of the clay paste prepared by the potters of this Elean region. Included for comparison are several Corinthian sherds excavated in Kyme, Italy, that are archaeologically classified as exports from Corinthia to Italy, and fragments of local Italian Corinthian imitations. The majority of the red‐figure vases were made locally in the north‐western Peloponnese and show the elemental pattern termed OlyA, which is represented in many vases and clay samples from this region that were known previously. It is not very different from the well‐known pattern of the north‐eastern Peloponnese (Argolid/Corinth) termed MYBE (Mycenae/Berbati), but can be separated by its lower Cs, Rb and K concentrations, as proven by many sherds from the Argolid and wasters from Berbati. Only a few red‐figure vessels are imports from Attica, but none come from Italy.     

CHARACTERIZATION OF RED‐COLOURED SLIPS (ALMAGRA) ON ISLAMIC CERAMICS IN MUSLIM SPAIN*

Small objects found in Islamic (eleventh‐century) kilns excavated in Zaragoza (Spain) were studied to determine the nature of the red coating of almagra pottery. Ceramics with almagra decoration were completely coated with a glossy deep‐red layer, a slip, applied to the body before firing. Chemical and mineralogical studies were carried out, together with analysis of a surface treatment with organic compounds. The results of this study confirm that almagra ceramics were produced by means of a specific and elaborate process (slip preparation, firing and wax application), demonstrating the introduction of this slip into local production during the Islamic period.     

双墩遗址、侯家寨遗址彩陶与红衣陶制作工艺的初步研究

双墩遗址、侯家寨遗址的彩陶和红衣陶,在制作风格和制作工艺等方面,在一定程度上反映着其文化特征。将双墩和侯家寨等相关遗址的彩陶和红衣陶的制作工艺作比较分析,明确了红彩和红衣的物相,并较为深入地探讨了它们的制作工艺和文化内涵。