References of "Salomon, Hélène"
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See detailEtude d'art mobilier en laboratoire par des techniques non destructives : analyse par faisceau d'ions et micro-diffraction pour caractériser les pigments préhistoriques et identifier leurs origines. Exemples de l'abri Pataud (Dordogne) et d'Arcy- sur-Cure (Yonne)
Beck, Lucile; Grégoire, Sylvain; Lebon, Matthieu et al

Conference (2011)

Les pigments préhistoriques sont formés à partir de composés naturels tels les d’oxydes de fer ou les oxydes de manganèse. Ils ont été collectés par les hommes préhistoriques dans leur environnement ... [more ▼]

Les pigments préhistoriques sont formés à partir de composés naturels tels les d’oxydes de fer ou les oxydes de manganèse. Ils ont été collectés par les hommes préhistoriques dans leur environnement proche ou parfois à de grandes distances. Connaître leur provenance géographique, ou à défaut établir des relations entre matière première retrouvée en fouille et objets archéologiques décorés, pourraient permettre de retracer la mobilité des populations et d’appréhender les choix techniques opérés ou la mise en place des décors.Ces relations et provenances peuvent être établies à partir de la composition chimique des matériaux employés. Il a été notamment démontré, que pour les obsidiennes ou les minéraux précieux tels les grenats ou les rubis, la nature et la concentration des éléments traces sont caractéristiques des milieux géologiques dans lesquels ils ont été formés. Dans le cadre de Madapca, la même démarche a été appliquée aux pigments préhistoriques. Elle s’appuie principalement sur la méthode d’analyse non destructive PIXE (Particule Induced X-ray Emission) et a été développée pour des pigments provenant des sites d’Arcy sur Cure (Châtelperronien, 32 000 BP) et de l’Abri Pataud (niveau Proto-Magdalénien, 22 000 BP). L’analyse élémentaire des éléments majeurs, mineurs et traces a permis de mettre en évidence des groupes de pigments de composition distincte au sein des niveaux archéologiques étudiés, et donc l’utilisation de sources de matière premières différentes. Dans le cas de l’Abri Pataud (Dordogne), il a été possible d’établir des correspondances entre la composition chimique des blocs de matière première composés d’oxydes de fer et celle des décors peints sur des éléments mobiliers ou sur les écailles ornées provenant de l’effondrement du plafond de l’abri. Dans le cas d’Arcy-sur-Cure (Yonne), nous avons pu montrer que la teneur en éléments traces variaient en fonction de la provenance des blocs de pigments rouges et noirs, trouvés en nombre dans la grotte du Renne. Cette étude démontre l’intérêt des techniques de spectrométrie X pour la différentiation des matériaux colorants utilisés en contexte préhistorique. [less ▲]

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See detailL'origine des hématites oolithiques exploitées durant la Préhistoire récente. Objectifs et méthodes d'un PCR
BILLARD, Cyrille; SAVARY; GOEMAERE, Eric et al

Poster (2011)

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See detailSélection et traitement thermique de matériaux colorants rouges sur le site moustérien es-Skhul (ca. 100 000 B.P., Israël)
Salomon, Hélène ULg; Vignaud, Colette; d'Errico, Francesco et al

Poster (2011)

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See detailCaractérisation des pigments préhistoriques par analyse PIXE
Lebon, Matthieu; Beck, Lucile; Lahlil, Sophia et al

Poster (2011)

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See detailAnalyse des pigments des dessins pariétaux de la grotte Chauvet à Vallon-Pont-d'Arc
Laval, Eric; Salomon, Hélène ULg; Vignaud, Colette et al

Conference (2011)

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See detailFading of modern Prussian blue pigments in linseed oil medium
Samain, Louise ULg; Silversmit, Geert; Sanyova, Jana et al

in Journal of Analytical Atomic Spectrometry [=JAAS] (2011), 26(5), 930

The fading of modern laboratory-synthesized and commercial Prussian blue, iron(III) hexacyanoferrate(II), based pigments in a linseed oil medium during exposure to light has been investigated. The ... [more ▼]

The fading of modern laboratory-synthesized and commercial Prussian blue, iron(III) hexacyanoferrate(II), based pigments in a linseed oil medium during exposure to light has been investigated. The Prussian blue pigments were painted from linseed oil, as a pure pigment and mixed with white lead, (PbCO3)2Pb(OH)2, zinc white, ZnO, or titanium white, TiO2, pigment. The samples were subjected to accelerated ageing for 800 hours and the light fastness of the Prussian blue pigment was evaluated by reference to blue wool standards. Pure Prussian blue is extremely light fast whilst it strongly fades when mixed with a white pigment, especially with lead white or zinc oxide. The painted samples were studied by UV-visible, iron K-edge X-ray absorption, iron-57 transmission Mössbauer, and attenuated total reflectance infrared spectroscopy. X-ray absorption results reveal a decrease in the iron coordination number in aged samples in the presence of white pigment. The Mössbauer spectra of the pure Prussian blue and the unaged and aged mixtures of Prussian blue and lead white or zinc oxide at 1:100 and 1:10 dilution ratios, respectively, indicate the presence of iron(II) and iron(III) in a ratio close to one as expected for the bulk stoichiometric KFeIII[FeII(CN)6]; no change in the spectral parameters was observed upon ageing. Combined with the X-ray near edge absorption and infrared studies, these results suggest reduction of the surface iron ions in the Prussian blue with ageing upon exposure to light. [less ▲]

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See detailPrehistoric art analysis, from the laboratory to in-situ measurement
Beck, Lucile; Menu, Michel; Laval, Eric et al

Scientific conference (2010)

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See detailAnalyse invasive versus analyse par faisceaux d'ions pour déterminer les sources géologiques de pigments préhistoriques de la grotte du Renne à Arcy-sur-Cure (Yonne, France)
Salomon, Hélène ULg; Beck, Lucile; Coquinot, Yvan et al

Conference (2010)

La grotte du Renne à Arcy-sur-Cure a été le théâtre d'occupations tardives par les derniers Néandertaliens, il y a environ 34 000 ans, soit avant l'apparition de l'art pariétal. Ils y ont utilisé d ... [more ▼]

La grotte du Renne à Arcy-sur-Cure a été le théâtre d'occupations tardives par les derniers Néandertaliens, il y a environ 34 000 ans, soit avant l'apparition de l'art pariétal. Ils y ont utilisé d'importantes quantités de roches pigmentées rouges et noires respectivement riches en fer et en manganèse. Les roches pigmentées ont été réduites en poudre soit par broyage, soit par abrasion, opération qui a produit des facettes d'usure sur les blocs. Le but de l'utilisation de ces matériaux n'est pas connu puisque Neandertal n'a laissé aucun témoignage de préoccupation esthétique. Rechercher les modalités d'acquisition des matières premières colorantes permet de connaître l'aire géographique fréquentée par ces hommes fossiles et de percevoir les propriétés de ces matériaux que les Néandertaliens désiraient exploiter. La caractérisation de ces matériaux s'est faite dans un premier temps par des méthodes de pétrographie traditionnelle impliquant le prélèvement parfois conséquent dans les matières colorantes archéologiques (prélèvement réduit en poudre pour la diffraction des rayons X, coupes pour faire des lames minces observées au microscope pétrographique). Ces investigations ont permis de distinguer deux sources d'approvisionnement en matières colorantes riches en oxydes de fer situées dans un rayon de 10 km autour de la grotte. Dans un second temps, la mise en place d'un protocole d'analyses non invasives visait à obtenir autant, voire plus, d'informations sur ces vestiges désormais connus, sans le moindre prélèvement. L'analyse par PIXE a permis de déterminer les éléments majeurs et les éléments traces marqueurs des groupes géologiques. Elle a pu être appliquée à la fois aux blocs bruts et aux blocs facettés pour lesquels les prélèvements sont impossibles. Les différentes sources de matières premières identifiées dans un premier temps par pétrographie, sont dans l'ensemble confirmées par PIXE. Mais une troisième source de roches rouges est à suspecter, ce que la pétrographie n'avait pas permis de déterminer. [less ▲]

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See detailHeat treatment of pigmented materials from es-Skhul (ca. 100 000 B.P., Israël)
Salomon, Hélène ULg; Vignaud, Colette; Coquinot, Yvan et al

Poster (2010)

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See detailL'analyse des pigments préhistoriques : du laboratoire aux mesures in-situ
Beck, Lucile; Laval, Eric; Menu, Michel et al

Conference (2010)

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See detailPigments from the Middle Palaeolithic levels of Es-Skhul (Mount Carmel, Israel)
d'Errico, Francesco; Salomon, Hélène ULg; Vignaud, Colette et al

in Journal of Archaeological Science (2010), 37

Discovery of pigments at Middle Palaeolithic sites is of interest in the context of the ongoing debate about the tempo and mode of the emergence of modern human behaviour. Here we analyse four previously ... [more ▼]

Discovery of pigments at Middle Palaeolithic sites is of interest in the context of the ongoing debate about the tempo and mode of the emergence of modern human behaviour. Here we analyse four previously undescribed fragments of pigmental material from Es-Skhul shelter, layer B, Israel, McCown excavations, identified at the Department of Palaeontology, Natural History Museum, London. One of them is still partially embedded in the hard breccia characteristic of this layer. Inspection of breccia fragments from layer B has led to the identification of small pieces of red and orange pigmental material still enclosed in large clasts, further corroborating the attribution of the larger pieces analysed in this study to layer B. The four objects are studied using optical microscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray (EDX), X-ray micro-diffraction (m-XRD), Particle-Induced X-Ray Emission Spectrometry (PIXE), and Proton-Induced Gamma-ray Emission (PIGE). The specimens display various hues of yellow, orange, red, and one of them presents a gradual variation of shade from yellow to dark orange. SEM/EDX analysis identifies two specimens (Skhul 1 and 2) as being composed of iron-rich calcium phosphate, the third (Skhul 3) of potassium-rich clay with titanium-rich iron oxide inclusions, and the fourth (Skhul 4) of pure iron oxide crystals. TEM/ EDX and m-XRD analysis demonstrate that three pieces (Skhul 1, 2 and 4) were heated to at least 300 C, a process that has partially or completely dehydrated goethite into haematite and changed their pristine yellow colour into orange or red. Skhul 3 shows no sign of heating, suggesting that its haematite content has a geological origin. The different mineral composition of the pieces suggests that they must come from a variety of sources. This implies that the associated collection strategies included the selection of materials that differed not only with respect to colour but also with respect to other physical and chemical properties. Although no formal proof exists that these lumps of pigmental material were deliberately heated, results obtained are consistent with this explanation. [less ▲]

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See detailStudy of the degradation mechanisms of Prussian Blue in paint layers by X-ray absorption spectroscopy
Samain, Louise ULg; Silversmit, Geert; Vekemans, Bart et al

Conference (2010)

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See detailLes matières colorantes au début du Paléolithique supérieur : sources, transformations et fonctions
Salomon, Hélène ULg

Doctoral thesis (2009)

Abstract : Despite an increasing number of studies, colouring materials are still poorly understood among excavation remains. Their attraction lies in their capacity to bring to light diverse and complex ... [more ▼]

Abstract : Despite an increasing number of studies, colouring materials are still poorly understood among excavation remains. Their attraction lies in their capacity to bring to light diverse and complex skills, but also in their intense colouring power and their contrasting colours : red and black, which still possess a symbolic value. These highly symbolic materials may, therefore, highlight the “conceptual” practices of prehistoric men and give access to their symbolic world and thought. In such a particular context as the transition between the Middle and the Upper Palaeolithic, these remains, which are very abundant in most excavations, offer the possibility, through analysis, to get an exceptional insight into the way of life of the last Neanderthals. The Châtelperronian site of the “Grotte du Renne”, in Arcy-sur-Cure (Yonne), is a landmark. It was excavated beween 1949 and 1963 by André Leroi-Gourhan : Numerous colouring materials were discovered there, and Leroi-Gourhan developed theories about their transformation and uses which so far have not been tested, and have remained unchallenged.Since their discovery, the assumption is that those minerals were heated in a controlled way, in order to modify their colour. It is indeed well-known that heat transforms yellow materials (iron hydroxides) in orange, red or purple materials (iron oxides). From this hypothesis originates the theory according to which Neanderthals exploited colouring materials as pigments for symbolic or even aesthetic purposes. But the theory has so far never been proved true. Our study combines several sets of data, obtained from different methods. Physico-chemical and petrological analyses were carried out on the colouring materials. These data were related to their location on the site, in association with exceptionally well preserved “hut” structures. Furthermore, a series of experimentations, aimed to characterize powders obtained via different methods (grinding and crushing on the one hand, abrasion on the other hand). The comparison of all these data enabled us to identify the various technical choices which informed the supply in colouring minerals in all the Châtelperronian levels of the Grotte du Renne. It was thus possible to demonstrate that none of these materials, either red or black, was heated before being used, contrary to what had been assumed so far. The supply in colouring materials was as carefully organised as for other materials (flint, for example) ; they were collected in geological formations occasionally showing on the surface, at more than 10 km from the cave. The exploitation of these geological sites did not vary during the whole Châtelperronian period, and privileged materials which can easily be ground into powder. Part of their supply was ground coarsely in order to cover large surface areas (soils or hides) as preservative or to clean them up. The remaining materials were destined to more meticulous activities, which required a fine, regular, and highly-colouring powder. In this latter case, the Neanderthals of the Grotte du Renne used those products when working on bone materials (bone or mammoth ivory), and used them also for their sheer colour. The set of colouring minerals from the Grotte du Renne reveals Neanderthals’ in-depth knowledge of materials ; they understood perfectly well their properties and qualities, and used them extensively, so that the Châtelperronian site must have been a literally dazzling sight, all red and black. The “chaîne opératoire” which transpires from our analysis shows very sophisticated techniques, and an advanced “technological” knowledge. They are witness to surprising capacities and a highly-evolved pattern of thought. [less ▲]

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See detailLes matières colorantes au début du Paléolithique supérieur
Salomon, Hélène ULg; Vignaud, Colette; Coquinot, Yvan et al

in Techné (2008)

A lot of settlements, some of which were occupied as long as 300 000 years ago, yielded small quantities of colouring matter. These quantities increased as time went by and as the palette of colours ... [more ▼]

A lot of settlements, some of which were occupied as long as 300 000 years ago, yielded small quantities of colouring matter. These quantities increased as time went by and as the palette of colours diversified, to reach a remarkable climax during the Upper Palaeolithic. Yet colouring matter has been widely ignored, notwithstanding the great potential information they contain about the technical knowledge, the cognitive capacities, the socio-cultural organisation of prehistoric societies and more generally about aesthetic and symbolic conceptions or  even language. The cave of Chauvet (Ardèche, France) is the most ancient testimony of cave drawing in Europe, with representations whose radiocarbon dating by AMS is 31 000 B.P. The origins of this form of art, which already evidences a perfect graphic mastery, are unknown and cannot be found in the previous periods. We thus have to search for clues of these artistic preoccupations in the colouring matter remains of more ancient cultures. But the use of colouring matter is far from limited to the production of parietal art, that was probably an exception among a large scope of more domestic uses, so far very little studied. We studied then a collection coming from the Chatelperronian layers in the “Grotte du Renne” (Arcy-sur-Cure, France), which was excavated in the 60’ by André Leroi-Gourhan. It is a very rich collection of pigments with various shades, which were systematically collected during the excavation. The ultimate purpose is to reconstitute the gestures that enabled the last Neanderthals in Europe to transform the colouring, abrasive, drying and prophylactic properties of these materials. This methodology also proposes to shed some light on their domestic and symbolic utilisations and to evidence the «chaînes opératoires» in the industry of colouring matter; and thus define the roles and the statutes of these materials in the societies of the Early Upper Palaeolithic period. [less ▲]

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