Study of color pigments associated to archaic chinchorro mummies and grave goods in Northern Chile (7000–3500 B.P.)
© Sepúlveda et al.; licensee Chemistry Central Ltd. 2014
Received: 17 July 2013
Accepted: 28 January 2014
Published: 4 March 2014
This article presents the results of physical–chemical characterization of the layers of coating covering the bodies, faces and stuffed of four mummified human bodies and seven grave goods from the Chinchorro Archaic funerary tradition that inhabited the Atacama Desert of the far northern coast of Chile. Using Scanning Electron Microscopy with Energy-Dispersive X-Rays (SEM-EDX) and X-Ray Diffraction (μDRX), the study identified the use of different pigments including iron, manganese and copper oxides that were combined into different preparations or pictorial recipes for paste and coating bodies and faces. The results indicate that the Chinchorro, an archaic hunting, gathering and fishing society (7000- 3500 B.P.) managed a complex color technology for their mortuary practices.
KeywordsPigment identification Mummification Color technology Northern Chile Chinchorro
The Chinchorro Tradition extended from 7000 to 3700 BP, which corresponds to the Archaic Period in the Andeans Region. These hunting, gathering and fishing people inhabited Southern Peru and Northern Chile, living along the coast taking advantage of a wide and abundant range of coastal marine resources generated by the Pacific Ocean’s cold Humboldt Current . As they settled on particular coastal spots huge accumulation shell middens have enable us to construct their daily lives, while their extensive cemeteries, found on the slopes of coastal bluffs and within the domestic areas, contain multiple overlapping packaged burials. Studies of the Chinchorro funerary procedures began in the early 20th century and we now know that, in addition to having a specialized technology well suited to extracting coastal resources, these groups developed a variety of complex methods for treating and preserving the bodies of their deceased, including artificial mummification [2–4]. For 5000 years these people developed extensive knowledge of human anatomy and morphology, which they used to create their mummies, the first ever in human history . The mummification techniques varied, both in terms of how they prepared, emptied and stuffed the dead bodies, and the application of different external finishes, and the latter feature has been used to classify the different funerary rites of these archaic coastal groups [6–8]. Three main forms of complex mummification have been identified among the Chinchorro: the Black Mummy Technique, the Red Mummy Technique and the Bandaged Mummy Technique. The Black Mummy Technique (ca. 7000–5000 BP) involved removing the organs, cleaning and reinforcing the skeleton then creating a clay mold of the body. Once the body was sculpted, the skin was replaced and painted over in a shiny black pigment. The face was covered with a clay mask painted in the same way. The Red Mummy Technique (4500– 4000 BP) differs from that of the black mummies in that each cavity of the body and head were emptied and then filled with a variety of materials (plant fiber, clay and feathers, among others). Once filled, the body was covered with red paint. A wig with long black hair was placed on the head of the deceased and kept in place with a black-colored cap. The face was covered with a black mask. The bandaged mummies are a variant of the red ones in which the skin was wrapped on the body like bandages . Unlike other mummification traditions around the globe [10, 11], the Chinchorro mummified adults, infants, newborns and even fetuses. In short, in practicing mummification or “the materialization of death” , these coastal hunter-gatherers employed complex techniques to prepare the body and used a wide variety of materials available in their surroundings, including wood, plant fiber, animal skin and hair, ash, clay and pigments.
Previous studies have used physical–chemical techniques to characterize certain elements and compounds used in the coating and stuffing of the Chinchorro mummies. Specifically, Energy-Dispersive-X-Ray-Fluorescence analysis (ED-XRF) was used to analyze the elements contained in the coating used on several mummified Chinchorro individuals [13–15]. In summary, the results indicated that more manganese was used in coating the red mummies (than the others), and this finding was confirmed by later Atomic Absorption Spectrometry (AAS) [16, 17]. While these ED-XRF and AAS analyses helped to recognize the elements present in the coating, the techniques employed did not allow us to identify the type of manganese mineral used. Furthermore, the techniques used also required crushing of the samples, which prevented us from identifying the different minerals present in the paint in the case of mixtures. Additionally, it was not possible to identify layers beneath the surface coating, in the sense of differentiating the surface layer from possible underlying or priming layers that are macroscopically visible.
Another study of the gray sediments used to reshape or remodeled three black Chinchorro bodies and the internal filling and external surface of one mud-coated mummy was undertaken by . Using a Scanning Electron Microscope (SEM) coupled with an Energy Dispersion Detector (EDS), the size and morphology of the clay compounds were identified. These results advanced our understanding of how malleable clays were used to construct the mummified bodies and functioned to preserve them. The absence of color pigments in these gray clays filling and the mud-coated mummy was also noted.
Lastly, continuing the emphasis on this type of compound, recent studies have addressed the chemical and mineralogical composition of the gray clay used as stuffing in the black mummies . The results obtained from EDXRF, SEM-EDX and μXRD analyses demonstrate that the clays are complex compositions based on quartz, albite, sanidine and muscovite occur naturally on the banks of rivers in the region. The gray clay was used to completely model the body including the face of the black mummies. The clay was collected and used in their natural state, without grinding or the addition of other compounds or color pigments.
In conclusion, for more than a decade different analytical techniques have contributed to study the different elements and compounds used in making the Chinchorro mummies. Despite the color analysis, however, the mineralogical nature of pigment from coatings and stuffed has still not been identified. Furthermore, the composition of the coatings must be distinguished from that of the stuffing. In other words, it is useful to specify whether the coatings correspond to a single layer of paint or several layers, as some authors have proposed before but without analytical or empiric proof [19, 20]. Lastly, it is necessary to compare these compounds with those present in grave goods, so we can identify if and how these artifacts were associated with the materialization of the bodies themselves. More specifically, we understand the artifacts and bodies to be part of the same color technology production sequence, defined as the complete production process, from the procurement of the raw materials to their application on a support [21, 22]. For this study, we ultimately chose to prioritize non-destructive techniques in order to preserve the samples for use in later analyses.
Material and methods
Results of grave goods analyses by SEM-EDX and μXRD
Pigment in a shell
Mn, Si, Ca, K, Al, Fe, Mg, Cl, S, Na
Manganese crystals not clearly observed (mixed with the other compounds)
Cryptomelane, quartz, anhydrite, calcite, diopside
MO-1 Tumba 25 Cuerpo 5
Pigment in a shell
Mn, K, Si, Ca, Cl, Al, P, S, Na
Manganese as 2-3 μm long grains
Cryptomelane, halite, quartz, calcite, albite
Fe, Si, Al, Ca, Cl, Na, trace of As
Hematite spherical grains, 10 μm in diameter or ovoide grains (1 μm thick)
Hematite, halite, kaolinite?
CA15-C, Cuerpo 3
Fe, Si, Al, Cl, K, S, Na, trace of As
Hematite spherical grains, 1 μm in diameter
Hematite, goethite, halite, quartz, calcite
Pigment in a shell
Si, Fe, Ca, S, Al, Cl, K, Na, trace of As
Hematite ovoid grains, 1 μm thick
Hematite, quartz, halite, anhydrite
Pigment on a griding stone
Fe, Si, Ca, Al, Cl, trace of As
Hematite pherical grains, 10 μm in diameter or ovoide grains, 1 μm thick
Hematite, halite, kaolinite
Powder in a leather pouch
Si, S, Fe, Ca, Al, Cl, Na, trace of As
Hematite cryslats with facets, 2-7 μm long and ovoid grains (1 μm thick)
Hematite, quartz, calcite, halite
Fe, Si, Al, K, Na, Cl, Ca, trace of As
Hematite spherical grains, 10 μm in diameter or ovoide grains (1 μm thick)
Hematite, halite, diopside? illite?
Fe, Si, Al, S, P, K, Na, Ca
Hematite ovoid grains, 1 μm thick
Hematite, gypsum, quarz, halite, calcite?
The samples were collected and packaged, at the Archaeological Museum of the Universidad de Tarapacá in San Miguel de Azapa, before being shipped to the LAMS and C2RMF laboratories (Laboratoire d’Archéologie Moléculaire et Structurale, Université Pierre et Marie Curie in Paris; Centre de Recherche et de Restauration des Musées de France in Paris, respectively) in France.
In the lab, each sample was observed in sequence under a Nikon SMZ-10A binocular microscope and at different magnifications under a Nikon-Labophot (5X, 10X, 20X, 50X, 2- Xenon lamp, B-2A filter; excitation, 450 to 490 nm; barrier, 520 nm; dichroic mirror, 505 nm) and a Scanning Electron Microscope (SEM, Philips XL 30 CP), using secondary electron (SE) and backscattered electron (BSE) modes.
After being observed front and back under an optical microscope, the samples were immersed in a resin (Resine Polyester SODY 33) for complementary observation and analysis. This kind of preparation is common in the identification and analysis of overlapping layers of paint primers and varnishes on historic paintings . It has also been useful for analyzing parietal and rock painting . In that state, the resins were polished on different surface carefully up to the edge of the sample then analyzed using the techniques proposed . Then, we can observe stratigraphy of different samples. We also recognize the form and size of inclusions, differentiating big or large ones with size between 50 and 100 μm, from small under 20 μm.
Afterwards, each sample was analyzed using Energy Dispersive Spectrometry (EDX) coupled with the SEM in order to obtain a qualitative identification of the elements present in the samples. The analyses were performed in BSE mode (20 KeV, 1000X-3000X), with both point and zonal identifications. Mapping of the most characteristic chemical elements in the sample was also performed to assess location and dispersion. To prevent any charging effect and obtain images with the highest resolution, each sample was covered with a fine layer of carbon. The INCA 4.15 program was used to acquire the data.
Lastly, the use of a Micro-Diffraction X-Ray device (μDRX), an homemade system in the C2RMF, was used to identify the crystalline phases in the pigments. The device consists of a X-ray tube with a copper anode (wavelength of λ = 1.54186 Å), a Kirkpatrick-Baez optical system and a Rigaku R-Axis IV 2D detector imaging plate. The X-ray beam is collimated to a diameter of 250 μm, while an incident angle of 6 to 10° enlarges the beam impinging the sample up to one millimeter. The diffracted X-rays are emitted in a 2θ cone and collected on the imaging plate, from which the diffractogram is extracted. The data were processed using the FIT2D program (http://www.esrf.eu/computing/scientific/FIT2D/), while identification of crystalline phases was performed using the EVA program (http://www.bruker-axs.de/eva.html). The analyzed thickness of the material depends on the weight on the elements: it is approximately 25 μm when it is composed by low Z elements (Al, Si, K) and about 5 μm for heavy ones, like Pb, Hg. The geometry of the system is calculated using an alumina powder reference at the beginning of a series of measurements. The acquisition time for one measurement is of 5 minutes. The spatial resolution of the system does not allow to characterize each layer on the samples cross-sections because the thickness of the colored materials is less than the size of the beam. To have a higher spatial resolution, it is necessary to use other instruments at synchrotron radiation facilities .
Analysis of the coatings
Descriptive of identified layers of M.26 (ARI- 8), from the surface to the coating
On the surface of this layer we can observe big yellow grain may be as an old decoration
On the surface of this layer we can observe the same yellow grains from Layer 3
Descriptive of identified layers of M.27 (ARI- 9), from the surface to the coating
Layer not very attached, difficult to analyse
Sample 19 (M.19) was difficult to prepare in resin. Observation under an optical microscope (white and ultraviolet light) showed that the sample consisted essentially of skin with a thickness of 350 to 450 μm. For the same reason the sample could not be analyzed using SEM-EDX. DRX analysis showed the presence of hematite, quartz, calcite, albite and kaolinite, despite the difficulty in observing these compounds.
Under microscopic observation, Sample 35 (M.35) did not reveal a layer of surface paint, but a heterogeneous layer approximately 200 μm thick was observed, composed of large black grains approximately 100 μm long contained in a brown mixture of smaller sized black, red, white and translucent minerals. Also, no layer of paint was visible on the surface under SEM-EDX, and it is therefore likely that this individual’s mask was not painted, but rather obtained its black color from the pigment contained in the molding placed over the face. The spectrum obtained by EDX indicates the co-localized presence of silica, aluminum and potassium, indicating that the sample may be a type of clay. Also observed were large grains of silica, possibly sand, and a compound rich in iron and sulfur. μDRX analysis confirmed the presence of cryptomelane, hematite, quartz, calcite, halite, albite and kaolinite. A jarosite mineral, probably natrojarosite, was also identified, but should be interpreted cautiously until it can be confirmed.
In general, the samples analyzed display similar characteristics in terms of shape and chemicals composition. The size and relative proportion of the minerals do vary, as observed in the sample slices and as indicated in the results previously obtained through EDXRF and AAS. One notable finding is that samples M.26 and M.27 (coming from a black mummy coating) empirically prove the presence of several overlapping layers of coating. These coatings are composed of a clay material (with quartz, calcite, albite, kaolinite and calcium sulfate) and a compound rich in manganese (cryptomelane and manganite). The relative proportions of these two main constituents varies from layer to layer, as does the size the inclusions, and it therefore follows that they are different preparations made with the same raw materials. Notable in the case of Sample M.26 are the two interfaces between layers 2-3 and 3-4, which could be interpreted as decorations applied before repainting. The layer of red pigment on the surface corresponds to the decoration currently visible; but this layer is very fragile and comes off easily.
Sample M.19 confirms that the surface coatings with paint might have been applied directly on the skin, as usually observed among the red mummies. Nevertheless, the layer is very fragile and most of it seems to have come off already. Sample M.35 shows that, despite the change in the mummification style from black to red, the technological tradition that produced the black-colored paint is indistinguishable between these two forms of mummification. These are pictorial mixtures that contain the same minerals and share the same production process, and they seem to have remained the same over time despite the fact that the black color, which initially was applied over the entire body, eventually was limited to the head alone.
Analysis of the stuffing
Analysis of the grave goods
Under SEM-EDX, the black color is primarily indicative of the presence of manganese moreover, other elements were found such as Si, Ca, Al and Na. One distinctive element identified was Fe, which was found in Sample 1 (M.1) at CA15-C. A difference was found in Sample M.17 from Mo-1, which doesn’t contain Fe but present P. Another difference observed was the identification of a manganese compound in the form of 2 to 3 μm needles embedded in layers of clay (Table 1). μDRX analysis determined that these elements correspond to cryptomelane, along with quartz, calcite and a variety of salts (anhydrite and halite, among others). The two samples correspond to paint adhered to the walls of a shell used as a container, and thus they are understood to be components of different compounds; however, some of the quartz and salts may correspond to sediments from the place where the object was found.
Results obtained from the analysis of the coatings applied to the mummies indicate that the mummies were painted several times, as we observed different painting layers. This empirical evidence could be interpreted in one of two ways: either the mummified bodies were not buried until they were fully materialized and several layers of paints were applied or they were buried and exhumed and painted from time to time. The uncertainty arises from the difficulty in determining whether the repainting occurred at the time the individual was mummified and while the body remained for some time among the living, or whether subsequent repainting was part of the funerary trajectory that required exhumation. We think that constant action of exhumation would have affected the condition of these fragile effigies, which is not the situation. Whatever the case, the action of repainting reaffirms the special attention that was paid to these materialized bodies, and this same attitude is also observed in the intentional repair of other mummies. The identification of the raw materials sheds light on the Chinchorro people’s knowledge of how to procure and prepare these materials. Despite the changes in the use of black color on the mummified bodies, from all the body in Black Mummies to head only in Red Mummies, the mixtures used remained for a long time.
Pigment analysis of the grave goods identified minerals similar to those specified on the mummified bodies, hematite and cryptomelane which had not be identified until now as previous studies had been only elemental [13–15]. As the hematite of the coast are different from those found in the highlands of this region , these may have come from different supply sites. Nevertheless, the identification of cryptomelane is particularly interesting, as the sources of this mineral are found above 4500 meters of altitude . This finding allows us to formulate interesting hypotheses about how the archaic hunting and fishing people of the coast may have journeyed to the highlands themselves or traded with highland hunter-gatherers to obtain this material . But we need to know more about the other hunter gatherer tradition development of archaic period to understand their possible exchange. Pigment analysis open the possibility to study economic side of this hunter gatherer from this Andean region.
From a technological perspective, the results obtained confirm that the coastal Chinchorro people had specific knowledge of pictorial recipes. The fact that pigments and clays were combined to make the paint that was then used to coat the mummies also points to specific knowledge of the raw materials used, particularly the plastic or additive qualities of the clays and the coloring strength of the manganese and iron minerals. Effectively, the Chinchorro artisans selected and carefully mixed these raw materials to obtain the desired colors, knowing how much of each material to use, how finely to grind them, and how to combine them. The results also suggest that they knew the source of the raw materials used in their preparations, some of which were located hundreds of kilometers away, as for example for cryptomelane.
In productive terms, the objects analyzed show the pigments in stages prior to its application on the bodies. Once the colored raw material was obtained, it was no doubt ground up and then stored as a powder or mixed with other compounds. The powder present inside the leather pouch corresponds to such a preliminary stage, while the lumps found correspond to another way of storing the pigment—mixed with clay compounds. The pigment or mixture could then be mixed again with water, for example, to liquefy it into a paint that could then be applied as a coating on the mummified bodies. Thus, the objects and the bodies analyzed display different stages of the same color production sequence. These results tell us something of the Chinchorro’s knowledge of color, from its procurement to application and even preservation. But we still do not know why, in the entire Andean area, only the Chinchorro people employed such color technology for mummifying their dead or to materialize bodies during the archaic period. To date, there is also no consensus about the origin of Chinchorro mummification practices or the origin of these coastal peoples themselves [8, 32].
In terms of funerary rites, the analysis confirmed that the mummified bodies were not buried or abandoned once the mummification process was complete. On the contrary, this long and laborious effort was part of a more prolonged ritual use and consumption, which would have involved the deterioration of the outermost layer of the coating. In social terms, the ‘materialization of death’ through the mummification of the bodies shows a degree of specific knowledge and careful, time-consuming preparation indicative of the presence of “mummification experts”. The practice seems to have developed primarily in the Late Archaic period when the coastal population increased, perhaps in association with climate changes and increasing water ressources that occurred at the end of the Middle Archaic [1, 4]. Also, Chinchorro artificial mummification was triggered by arsenic poisoning and grief . Arseniasis causes premature birth, stillbirth, spontaneous abortion and high perinatal dead, so Chinchorro parents facing high mortality rate of their babies (fetuses and newborns) started to preserve the tiny bodies to assuage their emotional grief. Mummification was a synergy between environmental constraints, grief, ideology and the afterlife.
Moreover, after the beginning of mummification process, the identification and use of different pigments may point to incipient social distinctions among the Chinchorro. Reviewing the chronology of the different types of mummification shows that one kind did not replace another, but rather, the black mummies were somewhat contemporary with the red ones, and the red ones with the natural mummies, although in general the black ones tend to be older than the red ones . Limiting the application of black color to the heads of the mummies, which occurred later, may have been related to the availability of the raw material, in this case manganese, although the same may be said about the different forms of hematite and cooper minerals. Nevertheless, changes in the Chinchorro’s mummification techniques can be also related to variation in social dimension of this group, specifically with ideological and/or symbolic sphere with aesthetic connotations. This may mean that access to and use of certain pigments was restricted to certain individuals, including fetus and children, especially if these minerals were difficult to obtain. Therefore, it is possible that the knowledge of color technology and of how to prepare the mummified bodies was in the hands of experts and was only available to certain individuals who enjoyed privileges within their group. The discovery of an adult individual with advanced osteoarthritis (as shown by deformities and joint immobility) with its head painted with iron oxide indicates that the members of the group treated this individual carefully both during life and after death . In other words, certain individuals with specific roles or status in life would have enjoyed similar treatment in death. Similarly, the scarcity of green color and scant use of copper minerals may suggest that these minerals were reserved for certain individuals.
Arriaza  argues that to understand the social dynamic of artificial mummification among Chinchorro the practice should be analyzed from the trilogy of the grieving individuals, the dead and the conception of the spiritual world. The author also affirms that artificial mummification was a central component of rituals that reintegrated both the grieving individuals into the real world and the deceased person (transformed into a mummy) into the spiritual world. He proposes that, once they were completed and adorned, the mummies became part of the world of the ancestors, and would have been venerated and cared for as such. In this regard, our analyses provide technical information to support the care that the ancient Chinchorro people showed for their mummified deceased.
MS Associate Professor and researcher, Departamento de Antropología and Director of Laboratorio de Análisis e Investigaciones Arqueométricas (LAIA), Universidad de Tarapacá. Doctorated from Université París 1- Panthéon Sorbonne. HR Research assistant, Laboratoire d’Archéologie Moléculaire et Structurale (LAMS), CNRS-UMR 8220- Université Pierre et Marie Curie (UPMC). Graduated from Université de Bordeaux. EV Research assistant, Laboratoire d’Archéologie Moléculaire et Structurale (LAMS), CNRS-UMR 8220- Université Pierre et Marie Curie (UPMC). Graduated from Université de Technologie de Compiène. BA Full Professor and researcher, Instituto de Alta Investigación, Universidad de Tarapacá. Doctorated from Arizona State University. VS Associate Professor and researcher, Departamento de Antropología, Universidad de Tarapacá. Doctorated from Universidad Nacional Autónoma de México. CS Full Professor, Instituto de Alta Investigación, Universidad de Tarapacá; Researcher Centro de Investigaciones del Hombre en el Destiero (CIHDE). Doctorated from University of Pittsburg. PW Researcher Director CNRS and Director of Laboratoire d’Archéologie Moléculaire et Structurale (LAMS), CNRS UMR 8220- Université Pierre et Marie Curie (UPMC). PhD from Université Paul Sabatier- Toulouse III.
This work was part of a France- Chilean cooperation and supported under the grant ECOS-CONICYT C09-H03: Caracterización físico- químico de los “nano-cosméticos” utilizados en las momias de la cultura Chinchorro del extremo norte de Chile and FONDECYT 1100354. We also would like to thank to MECESUP UTA 0801 and Convenio de Desempeño Universidad de Tarapacá- MINEDUC.
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