Brass Objects Research Articles

Номенклатура металлов и сплавов из сарматских могильников Нижнего Поволжья II в. до н.э. – первой половины II в. н.э. по данным РФА

The work presents the results of an analysis of the chemical composition of 82 objects from non-ferrous and precious metals dating from the 4th century BC – the first half of the 2nd century AD and originating from the excavation of funeral monuments located in the Lower Volga region. Basically, the analysis of the chemical composition of non-ferrous metal was carried out for objects characteristic of the ordinary population of the region: mirrors, jewelry, clothing or household items, and details of horse harnesses; importantly, sampling was random. The data obtained by the XRF method are very interesting and demonstrate a change in the nomenclature of leading alloys. So, for the period of the 2nd century BC – the border of eras, there is a significant number of objects from tin as well as from tin-lead bronze, with a slight presence of products from a multicomponent alloy, an alloy with arsenic. For the period of the 1st – the first half of the 2nd century AD, there is a significant change in the leading types of alloys: zinc-containing alloys such as two- and three-component brass dominate the sample; also significantly increased the share of triple bronze, highly alloyed with lead; there are also products made of copper and tin bronze. Silver products made of silver from different samples are present in all stages. Analysis of alloying components and impurities in the identified alloys made it possible to distinguish in the sample of the 2nd century BC –the border of eras, the influence of the North Caucasian center of non-ferrous metalworking; recorded changes in the nomenclature of alloys of the 1st – the first half of the 2nd century AD arose, most likely, under the influence of the North Black Sea center of non-ferrous metalworking. The presence of high-zinc brass objects in the sample during the period of the 1st – the first half of the 2nd century AD also does not exclude the receipt of this type of brass from the production center located in Central Asia, which is characterized by an extremely high zinc content in the alloy.

Archaeometallurgical characterization of Late Antique personal adornments. The necropolis of Cortijo del Chopo (Granada, Spain)

Objects of personal adornment from Late Antiquity have been extensively studied in the Iberian Peninsula since the 19th century, when the first funerary contexts from that period began to come to light. However, only partial information was available with regard to their production process and chemical composition. This came from the archaeometallurgical studies carried out on funerary assemblages from central and northern Iberia. In order to obtain a more complete picture, a set of 80 copper-based alloy objects were analysed, most of ornaments and parts of them, from the necropolis of Cortijo del Chopo (Granada), in southeastern Spain. The results from the portable X-ray fluorescence reveal the presence of a wide variety of alloys and confirm the practice of recycling metals to make the items, a characteristic of the metallurgy of the period. Lead isotope analysis provide evidence of a local production of brass objects with a high Zn content, similar in appearance to gold.

Engraved Property: The Titles and Names of Rasulid Women on Ayyubid and Mamluk Metalwork

Abstract Inscriptions containing women’s titles and names on objects are relatively rare occurrences throughout the Islamic world, whether they belong to known personalities or to unknown individuals. This article examines graffiti in the names of women from the Rasulid dynasty in Yemen (626–858/1229–1454), incised on silver-inlaid brass objects mostly made in Mamluk workshops (seventh–eighth/thirteenth–fourteenth centuries) as commissions, gifts, or purchases for the Rasulid sultans of Yemen, which have hitherto been unidentified. Moreover, the titles of these princesses also are found on Ayyubid metal objects. Although of little aesthetic value, these inscriptions hold great historical and social significance by providing details on inheritance, lineage, ownership, and the object’s history.

Early brass from the Foyemiaowan-Xindiantai cemetery, 265–439 ce: the origin and diffusion of brass in ancient China

The Foyemiaowan-Xindiantai cemetery, with more than 10,000 tombs, is located in north-west Gansu Province. The cemetery was active during the Sixteen-State Period of the Western Jin Dynasty (265–439 CE). As the largest ancient tomb group in the Dunhuang region, its cultural core is still mainly based on the cultural tradition of the Central Plains. Metal objects were texturally and chemically analyzed by optical microscopy (OM), scanning electron microscopy coupled with energy-dispersive spectrometry (SEM–EDS), and Raman spectroscopy. The analysis of 36 copper-based objects showed that the main alloying elements were tin and lead, while three objects were brass, with copper and zinc as the main elements. These three pieces of brass are the earliest brass objects found in Gansu Province. The brass contains numerous sulfide inclusions, indicating that the raw materials used to make these objects contained a large amount of residual sphalerite instead of being “pure” calamine. They were then hot forged directly from the original smelted brass, without having been remelted. Brass may have reached China during the Wei Jin Southern and Northern Dynasties (220–589 CE), but it was not widely used in China before the Ming Dynasty (1368–1644 CE). According to the statistics and relevant studies of brass unearthed before the Ming Dynasty in China, although the distribution of brass objects spans a considerable period, it concentrates in three areas from the early to the late stage, showing phased development characteristics. This includes accidental smelting in the Central Plains and Haidai areas, followed by external introduction in the northwest, and the emergence of local production in northeast China. Most brass objects contain lead and tin, which requires further exploration.

Thickness determination of the gilding on brass materials by XRF technique

The gold coating layer of the gold-plated brass objects was estimated using calibration curves obtained with a handheld X-ray fluorescence spectrometer (XRF). Calibration curves were obtained using reference materials (Au and brass) and intensity ratios of the X-ray fluorescence peaks generated in both the gold coating and the brass substrate. In addition, a calibration was also performed with the PLS (Partial Least Squares) multivariate analysis method. Good agreement was obtained by comparing the results of the different methods. The calibrations were successfully applied to gold-plated brass jewels and samples.

A case study for scientific research prior to conservation of marine metal artefacts

A rare find of a high-status 17th century oval box, retrieved from a shipwreck, provided a unique opportunity to research the construction and finishing layers of an object that is untouched for 350 years. This case study was used to demonstrate the extent of data that can be gained from analytical techniques prior to conservation. The amalgam-gilt brass object was studied by optical and electron microscopy, X-radiography, micro-computed X-ray tomography, neutron tomography, X-ray fluorescence, X-ray diffraction, Rutherford backscattering spectrometry, proton-induced X-ray emission and gas chromatography. The results have led to a characterisation of the manufacturing methods used on the box and to a better understanding of the practicality of modern analytical methods and techniques in (maritime) archaeological research.

Technological transition and complexity reflected in bronze and brass objects from the medieval site in the Aral Sea region

The medieval period in the region near the Aral Sea must have been the era of significant sociopolitical changes and notable transitions in material culture. This prediction was tested with a metal assemblage consisting of numerous bronze and brass objects, mostly small items for personal use, excavated from the medieval (ca. 800–1000 AD) site near the Aral Sea in Kazakhstan. A technological transition driven by the growing reliance on brass was noted in the remarkable complexity in alloy recipes, in which recycled bronze and cementation brass served as the key materials along with elemental copper, tin, and lead. Different combinations of these materials were found to have resulted in the establishment of a dual technological tradition based on both bronze and brass. The notable transition and complexity as observed in the metal assemblage under consideration are interpreted as a reflection of the dynamic political settings in which both mobile pastoralist and sedentary farming groups were incorporated to form a dual social structure.

Local cementation brass production during 12th–13th century CE, North China: Evidences from a royal summer palace of Jin Dynasty

Twenty-one brass objects including building ornaments and household objects were found at the Taizicheng Ancient City Site in Hebei Province, a royal summer palace dated to the mid-late Jin Dynasty (CE 1189–1217). The samples were analyzed using XRF, SEM-EDS, ICP-AES and MC-ICP-MS to investigate the production technology, chemical compositions and lead isotopes of the brass objects. The results show that these brass objects might have been made roughly at the same time using local cementation technology. The lead isotope results indicate that the copper or zinc used to produce brass most likely originated from local ores in Northeast China. These brass objects represent one of the earliest instances of brass made with cementation technology in China, and are different from imported brassware from the Western countries during 4th–9th century CE. We believe that the diffusion and localization of cementation technology might have been the result of trade along the Silk Road and a shortage of tin in northern China during the 12th–13th century CE, which prompted Chinese metalworkers to produce brass.

Hand-to-mouth and other hand-to-face touching behavior in a quasi-naturalistic study under controlled conditions

ABSTRACT Data gaps exist in our understanding of hand-to-mouth touching behavior among adults, despite its relevance for accurately characterizing inadvertent ingestion exposures to chemical and pathogenic microbial agents and consequent associated health risks. The present study describes detailed observations of the frequency and nature of hand-to-mouth and other hand-to-face touching behavior among 14 male and female volunteers in a controlled, quasi-naturalistic setting. Participants performed four 15-min tasks: 1) installation of a brass object as part of a short home improvement project, 2) completion of a pen-and-paper survey, 3) engagement in a telephone conversation, and 4) use of headphones to listen to music. Video recordings of the participants performing each task were reviewed and coded for touches to the face with emphasis on specific regions of the face and palmar versus dorsal contacts. During the installation task, only one of the 14 participants was observed touching his face; this was to the nose, on two separate occasions. Summed across the three non-installation tasks, including palmar and dorsal contacts, participants touched their lips, their mouth, and anywhere on their face on average (range) 5.1 (0–19), 0.4 (0–3), and 27.7 (6–49) times, respectively. Facial contacts during these three non-installation tasks were predominantly with the palmar surface of the hand. The implications of these data are contextually specific, as the potential health impacts of face touching behavior among adults might differ based upon toxicity or virulence of hand contaminants of interest.

Lost in time? : Revisiting the Szentes pendant from the British Museum

The interregional contacts between the cultures in the Pannonian Basin and the rest of Europe are a well-established research topic for virtually all archaeological periods. Sometimes the existence of past networks and entanglements is best captured by a narrow insight, such as a specific historical episode or a single object. This approach is adapted to a peculiar pendant from Hungary that remained marginal for the scholarly attention but has a complex background. By using data on the origin of the small brass object, archaeological and ethnographic analogies, its cultural connections and historical background can be reconstructed. With the help of these approaches the basic chronological questions related to this object are also re-considered.

Benchmarking PGAA, in-beam NAA, reactor-NAA and handheld XRF spectrometry for the element analysis of archeological bronzes

Novel detection strategies were developed to improve the PGAA methodology in the analysis of bronze and brass objects. Instrumental neutron activation analysis and X-ray fluorescence were also involved in this study for comparison. The approach was tested on a set of IRMM-certified copper alloys. Reference values for the concentrations of four major additive components (As, Zn, Sn, and Pb) were compared with the results obtained by the involved methods. The bias observed between the reference Sn values and the initial PGAA results was successfully addressed by considering the interference of this line with low intensity copper prompt gamma peaks. In this report results are presented, and the analytical merits are compared.

Between Fakes, Forgeries, and Illicit Artifacts—Authenticity Studies in a Heritage Science Laboratory

Since its inauguration in 1888, the Rathgen Research Laboratory of the National Museums in Berlin has been challenged by authenticity questions on cultural heritage objects. In the setting of an ever-growing market, often intertwined with the increasing global impact of illicit traffic, scientific investigations can contribute equally to art-historical, or archaeological expertise when solving questions of authenticity, and should therefore always be included when significant values are at stake. Looted or stolen artifacts, copies, fakes, and forgeries have been an intrinsic element of the market since ever, and only selectively addressed in a trans-disciplinary, more holistic way. This paper makes the case for a reliable, state-of-the-art analysis and illustrates the potential benefits of such a scientific approach to authenticity questions in selected examples: 1. the case of German art forger, Wolfgang Beltracchi; 2. brass objects of alleged Benin and Ife provenance.

Acoustically sticky topographic metasurfaces for underwater sound absorption.

A class of metasurfaces for underwater sound absorption, based on a design principle that maximizes thermoviscous loss, is presented. When a sound meets a solid surface, it leaves a footprint in the form of thermoviscous boundary layers in which energy loss takes place. Considered to be a nuisance, this acoustic to vorticity/entropy mode conversion and the subsequent loss are often ignored in the existing designs of acoustic metamaterials and metasurfaces. The metasurface created is made of a series of topographic meta-atoms, i.e., intaglios and reliefs engraved directly on the solid object to be concealed. The metasurface is acoustically sticky in that it rather facilitates the conversion of the incident sound to vorticity and entropy modes, hence the thermoviscous loss, leading to the desired anechoic property. A prototype metasurface machined on a brass object is tested for its anechoicity, and shows a multitude of absorption peaks as large as unity in the 2-5 MHz range. Computations also indicate that a topographic metasurface is robust to hydrostatic pressure variation, a quality much sought-after in underwater applications.

Selling Authenticity in the Bamum Kingdom in 1929–1930

In February 1930, Eugene Pittard, the director of the ethnological museum in Geneva, sought to expand his museum’s collections in an unusual manner. Instead of sponsoring an expedition to Africa or acquiring objects from former missionaries, instead of buying from established dealers in ethnographic specimens or the newer galleries that specialized in l’art negre, Pittard wrote to an African man in Africa, a Bamum man named Mose Yeyap (Pittard 1930) (Fig. 1).1 Yeyap was the head of the relatively new artisanat in Foumban, a school and artists’ cooperative founded in 1927, and he was known as a key figure for collectors seeking to acquire works of art from the Bamum kingdom. Pittard’s letter explained that he “would like to assemble ... as true a picture as possible of the population of which you are a part, that is to say of the material life of this population. I am sending you by the same post [a list of] the kinds of things that would be the most interesting to have” (Pittard 1930). Pittard explained pointedly, “I insist on one point: Our intent is to have the oldest objects; those which have not been subjected to European influence.” He then listed for Yeyap the kinds of objects he had in mind: “sculpted wood masks, statues, sculpted horns, etc. ... sculpted drums with carved animals or other designs. Miss Debarge [a physician known both to Pittard and Yeyap] showed me drawings on paper that you made of sculptures. Is it possible to have these sculptures themselves?” (Pittard 1930). Pittard’s letter, of course, epitomizes how European arrogance and fantasy informed the collection of African art in the first decades of the twentieth century. Pittard condescendingly and absurdly schooled Yeyap about Yeyap’s own culture and, by privileging his desire for “the oldest objects,” those supposedly untouched by “European influence,” Pittard revealed his adherence to the chimerical “ideal” of African cultures as isolated in time and space. In a fascinating twist, however, we also have Yeyap’s response to Pittard. Yeyap answered back:

Ceramic Sherds from the Millsey Williamson Site (41RK3), Rusk County, Texas

The Millsey Williamson site (41RK3) is an 18th century Nadaco Caddo settlement and cemetery situated on an alluvial terrace on the east side of Martin Creek in the Sabine River basin. Some portions of the site are now covered by the waters of Martin Creek Lake, constructed in the 1970s. The site was first investigated in the 1930s, when at least 11 historic Caddo burials were excavated in the cemetery at the western end of the landform. Buddy Calvin Jones excavated a disturbed historic burial at the site in 1955, and also occasionally collected glass beads from the surface of the site. The funerary offerings placed with this disturbed burial were not clearly enumerated by Jones, as his description of artifacts from the site included artifacts he examined in several other collections. He did note 275 sherds from the surface of the site and 12 whole or restored ceramic vessels from an unknown number of burials. Most of these sherds were recorded by Jones as being grog– (52 percent) or bone–tempered (43 percent), but 4 percent were tempered with shell. Perttula and Nelson recently documented 11 vessels from the Millsey Williamson site in the collections of the Gregg County Historical Museum (GCHM). These vessels include a Emory Punctated–Incised (shell– tempered) collared jar; a Maydelle Incised jar; a Bullard Brushed jar; a jar with brushing only on the body; a Ripley Engraved, var. unspecified carinated bowl; Simms Incised carinated bowl; two unidentified engraved carinated bowls with a continuous stepped rectilinear scroll design; a carinated bowl with a sprocket rim with a continuous negative scroll design; a carinated bowl with diagonal opposed and cross–hatched engraved lines on the rim; and a plain olla. The ceramic vessels are of diverse manufacture, form, and decorative methods. Most are carinated bowls and jars tempered with grog and bone, and fired in a reducing environment, and the former are decorated with engraved lines, while the latter are decorated incised, punctated, or brushed utility wares. On their own stylistic merits, none of these vessels in the GCHM collections is that of a recognizable Historic Caddo type, such as Natchitoches Engraved, Simms Engraved, var. Darco, or Keno Trailed, and in fact, most of these vessels cannot be identified as examples of specific types. The vessels that can be typed include Emory Punctated–Incised, Maydelle Incised, and Bullard Brushed jars and a Ripley Engraved, var. unspecified carinated bowl; one vessel has been dubbed Simms Incised because it is of a form and decorative style that matches Simms Engraved, except the motif is executed with incised lines. Also recovered from the site were clay and limonite pipes, ochre and vermillion, animal teeth, glass beads, metal gun parts, gun flints, iron knives, iron arrow points, and awls in the Millsey Williamson collection. There were also a variety of brass objects: a brass tinkler, coils, hawk bells, and unworked pieces of sheet brass.

Metallurgical characterization of brass objects from the Akko 1 shipwreck, Israel

The Akko 1 shipwreck was a small Egyptian armed vessel or auxiliary naval brig built in the eastern Mediterranean at the beginning of the 19th century. During the underwater excavations, about 230 brass hook-and-eye closures were found, mainly in the bow area. In addition, 158 brass cases were found, mainly between midships and the aft extremity of the shipwreck. Metallurgical non-destructive and destructive characterizations of selected items were performed, including radiographic testing, XRF, lead isotope analysis, optical microscopy, SEM–EDS and microhardness tests. The hook-and-eye closures and the cases were both found to be made of binary copper–zinc alloy (about 30wt.% zinc). While the brass cases were made from rolled sheets, hand-made using simple tools, and joined by tin–lead soldering material, the brass hook-and-eye closures were hand-made from drawn brass wire, and manufactured from commercial drawn brass bars by a cold-working process. The lead isotope analyses suggest different provenances of the raw materials used for making the brass objects, thus the different origins of the ores may hint that the brass wire and sheet were imported to the workshops in which the objects were manufactured.

The Millsey Williamson (41RK3), Bead Burial, and L. N. Morwell Farm Sites on Martin Creek: Historic Caddo Settlements along Trammels Trace, Rusk County, Texas

There are collections of ceramic vessels and other artifacts from the Millsey Williamson (41RK3), Bead Burial, and L. N. Morwell sites in the Buddy Jones collection at the Gregg County Historical Museum. The purpose of this article is to put the documentation of these collections on record, as this documentation provides previously unavailable detailed information on the material content of probable 18th century Nadaco Caddo/Kinsloe phase historic sites in East Texas. Based on the limited available information from the Bead Burial and L. N. Morwell Farm sites, it is probable that all three sites are different names for the same Historic Caddo site situated along the Rusk and Panola County line in East Texas on Trammel’s Trace that was reported on by Jones. The Bead Burial site is reported to be ca. 5 miles south of Tatum along the Rusk-Panola County line, and the Millsey Williamson site is well known for the quantity of glass trade beads found there. The L. M. Morwell Farm site was excavated by C. W. Bailey in 1940, and a tag accompanying two ceramic vessels recovered from a Burial 4 at the site describe it as “Rusk Co. Martin Creek old trading post on Trammels trace.” Jones indicates that the Millsey Williamson site is an 18th century Nadaco Caddo settlement and cemetery situated on an alluvial terrace on the east side of Martin Creek, a northward-flowing tributary to the Sabine River. Some portions of the site are now covered by the waters of Martin Creek Lake, constructed in the 1970s. The site was first known in the 1930s, when at least 11 historic Caddo burials were excavated in the cemetery at the western end of the landform, and there was a habitation/village area on the highest part of the landform, east of the cemetery. Jones excavated a disturbed historic burial at the site in 1955, and also occasionally collected glass beads from the surface of the site. The funerary offerings placed with this disturbed burial are not clearly enumerated by Jones, as his description of artifacts from the site includes artifacts he examined in several other collections. He did note 275 sherds from the surface of the site and 12 whole or restored ceramic vessels from an unknown number of burials (Jones 1968:Table 1). Most of these sherds were grog- (52%) or bone-tempered (43%), but 4% were tempered with shell. There were also clay and limonite pipes, ochre and vermillion, animal teeth, glass beads, metal gun parts, gun flints, iron knives, iron arrow points and awls, and a variety of brass objects: a brass tinkler, coils, hawk bells, and unworked pieces of sheet brass.

The ancient brass cementation processes revisited by extensive experimental simulation

Prior to the mastering of metallic zinc production in the mid-19th century, brass making in Europe was based on the so-called cementation process: within a more or less closed vessel, gaseous zinc is produced by the carbothermic reduction of zinc ore at around 1,000°C (±100°C), and simultaneously diffuses into metallic copper. Few ancient brass objects dated before the Industrial Revolution analyzed so far bear more than 30 wt.% zinc, so that this zinc content value has become a dating criterion for these artifacts. The systematic laboratory-scale experimental simulations of the ancient process presented here permit the multiple influences of temperature, isothermal treatment duration, and initial Zn/Cu ratio on the zinc content of the final products, and on the zinc recovery rates as well, to be investigated for the first time.

Cultural continuity and its implications on human evolution: A study from eastern Indian

Evidence of human evolution in India is mainly limited to cultural remains. Despite lack of proper absolute chronology a developmental pattern is established. Present work focuses on a specific region in the state of Orissa, located on eastern plateau region. So far no human fossil remain has been found from this area but there is enough cultural evidence to postulate evolutionary sequence. The earliest cultural remain, rich in Acheulian tradition, is found from the lower gravel bed, dated c. 0.3 myr B.P. on the basis of Toba ash. Then onward cultural evidences are found constantly from subsequent beds. Size diminution and refinement of technology is the hallmark for progress. Celts and polishing grinding technology is generally considered as the final phase of Stone Age technology. Findings from the region indicate continuation of the Stone Age tradition for a long time even into the recent past. The earliest metal finding is brass. This alloy is not only persisting in the region but even the technology of making brass objects is the same today. The tribal communities, the indigenous people living in the area, bear a legacy of behavioural strategy for survival. It appears that in the areas, life continued without a break from prehistory to present day in a processual manner. A similar situation is found in Africa, where as a result of comprehensive work the process of continuity is properly understood. In India, lack of absolute dates is the major hindrance for this kind of work. An attempt is made here to understand the behaviour, ecology and other related factors responsible for cultural continuity in the studied area.

Raman spectroscopy of the polyanionic copper(II) minerals buttgenbachite and connellite: implications for studies of ancient copper objects and bronzes

AbstractThe minerals connellite and buttgenbachite, complex hydroxy sulfate and nitrate, respectively, of Cu(II), are rare products formed during the corrosion of bronze and brass objects. Infrared and Raman spectra of buttgenbachite and connellite were obtained at 298 and 77 K using a Raman microprobe in combination with a thermal stage. The Raman spectra show the presence of nitrate, sulfate and chloride in the mineral. Spectra of the hydroxyl‐stretching region are complex with multiple bands being observed. These observations are in agreement with the structure of the minerals in that the nitrate ion occupies two different sites and that six hydroxyl groups are crystallographically independent. Various OH stretching bands are attributed to independent hydroxyl units in the crystal structure and zeolitic water OH stretching modes. Raman spectroscopy is an excellent technique for the identification of these complex minerals and for the determination of the distribution of anions in their structure. Copyright © 2002 John Wiley & Sons, Ltd.