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A3TEX Diagnostic Analysis on Ethnographic Artifacts

Ethnographic textiles are among the most fragile and complex artifacts in cultural heritage collections. Unlike traditional textiles, which are often well-documented and widely studied, ethnographic textiles present unique challenges due to their multimaterial composition, diverse production techniques, and exposure to varying environmental conditions over time. These artifacts are often made from organic materials such as barkcloth, feathers, vegetable fibers, natural dyes, and resins, many of which are susceptible to degradation, discoloration, and microbial growth.

One of the greatest challenges in the study and conservation of ethnographic textiles and artifacts lies in the lack of historical documentation on their materials and craftsmanship. Traditional production methods were often transmitted orally within indigenous communities, and many of these techniques have been lost due to colonial disruptions, cultural shifts, and globalization. Additionally, past restoration interventions—sometimes carried out without a deep understanding of the original materials—have introduced foreign substances, such as adhesives, pesticides, or synthetic consolidants, further complicating conservation efforts.

Project details

Preserving the Legacy of Ethnographic artifacts

Ethnographic artifacts, including painted barkcloths, feathered headdresses, and dyed leather puppets, represent significant aspects of cultural heritage. Their unique compositions—often involving organic materials such as natural fibers, animal skins, organic dyes, and adhesives—pose serious challenges for their conservation. Over time, these materials degrade due to exposure to light, humidity, pollutants, and past conservation treatments, making them particularly fragile.

A critical issue in textile and painted artifact diagnostics is the identification of dyes and materials while ensuring non-invasive or minimally invasive analysis. Many of these artifacts have undergone alterations, either through environmental degradation or historical restorations, which complicates conservation efforts. Therefore, an advanced, multi-analytical approach integrating spectroscopic and imaging techniques is essential to study these materials, preserve them, and support appropriate restoration strategies.

This study of A3TEX conservation scientists integrates findings from multiple analyses conducted on ethnographic textiles and traditional artworks, including:

Polynesian barkcloths and feathered headdresses (Fig. 1)

Tholu Bommalu Indian shadow puppets (Fig. 2)

Painted historical textiles

Each artifact was examined using cutting-edge analytical methods to determine material composition, identify organic dyes and pigments, and assess conservation needs.

Additional Insight

Analytical Techniques Used

A comprehensive multi-spectroscopic and imaging approach was employed, including:

Multispectral Imaging and UV Fluorescence (UVF, Figs. 3a, 4a, 6) – Used for material differentiation, preliminary dye mapping, and degradation assessment.
Fiber Optic Reflectance Spectroscopy (FORS, Fig. 7, Fig. 9) – Provided initial insights into the dye molecular classes.
X-ray Fluorescence Spectroscopy (XRF, Table S1) – Identified inorganic components, including pigments and contamination from previous restoration efforts.
Fourier Transform Infrared Spectroscopy (FTIR, Fig. 10a, 10b) – Analyzed organic binders, adhesives, and degradation products.
Scanning Electron Microscopy with Energy-Dispersive Spectroscopy (SEM-EDS, Fig. 8, 9) – Examined fiber morphology and elemental composition.
Surface-Enhanced Raman Spectroscopy (SERS, Fig. 11, Fig. 12) – Allowed for the high-sensitivity identification of both natural and synthetic dyes.

Key Findings: Characterization of Dyes and Fibers

Polynesian Barkcloths and Feathered Headdresses

The Polynesian tapa barkcloth (Ta262, Fig. 1) was painted using a yellow turmeric-based dye (Curcuma longa) and a red anthraquinone dye (Morinda citrifolia).
The Marquesan feathered headdress (pa’e ku’a, M098, Fig. 2) contained Vini kuhlii feathers, identified through psittacofulvins, natural pigments responsible for red and yellow hues.
FTIR analysis confirmed the use of starch-based polysaccharides as adhesives for the tapa, while the headdress used Cerbera manghas L. (natural rubber extract).
Arsenic residues detected in the headdress feathers (XRF, Table S1) suggested historical pesticide treatments to prevent insect damage.

Tholu Bommalu Indian Shadow Puppets

The Indian shadow puppets (Tholu Bommalu, Fig. 1a, 1b) were analyzed to investigate the transition from natural to synthetic dyes.
Fiber Optic Reflectance Spectroscopy (FORS) and SERS analysis confirmed the presence of synthetic dyes, including:
- - Rhodamine B (Pink-red areas, SERS Fig. 4, 5)
  - Eosin Y (Red sections, SERS Fig. 6)
  - Crystal Violet and Malachite Green (Blue-green sections, SERS Fig. 5, 6)
  - Mono-azo dye compounds (Yellow areas, SERS Fig. 5)
The leather composition of the puppets was identified as goat skin through ZooMS (collagen-based species identification), confirming historical production techniques.

Diagnostic Analysis on Ethnographic Textiles Using Non-Invasive and Micro-Invasive Methods

The research of A3TEX conservation scientist focused on the diagnostic analysis of ethnographic artifacts from French Polynesia, specifically a painted barkcloth and a feathered headdress. The primary objective was to characterize the materials, evaluate their conservation state, and inform restoration efforts. Given the fragile nature of these materials, conservation efforts were tailored to minimize intervention while ensuring artifact stability. The combination of non-invasive and micro-invasive analytical techniques has proven essential in the characterization and conservation of ethnographic textiles and historical artworks.

The importance of spectroscopic and imaging technologies in detecting both natural and synthetic dyes. The non-invasive diagnostic approach successfully identified the dyes, fibers, and conservation challenges of the analysed Polynesian, Marquesan, and Indian ethnographic artefacts, helping to reconstruct historical dyeing traditions. The A3TEX researchers provided crucial insights for developing appropriate restoration and conservation protocols, ensuring the long-term preservation of these rare and historically significant artifacts.

Selected Publications

Greta Peruzzi, Alessandro Ciccola, Adele Bosi, Ilaria Serafini, Martina Negozio, Nagmeldeen Morshed Hamza, Claudia Moricca, Laura Sadori, Gabriele Favero, Valentina Nigro, Paolo Postorino, Roberta Curini (2023). Applying gel-supported liquid extraction to Tutankhamun’s textiles for the Identification of ancient colorants. A case study. GELS, vol. 9, p. 1-13, ISSN:2310-2861, doi: 10.3390/gels9070514.
Colantonio C., Lanteri L., Ciccola A., Serafini I., Postorino P., Censorii E., Rotari D., Pelosi C., (2022). Imaging Diagnostics Coupled with Non-Invasive and Micro-Invasive Analyses for the Restoration of Ethnographic Artifacts from French Polynesia, Heritage 2022, 5, 215–232. https://doi.org/10.3390/heritage5010012
Ciccola A., Serafini I., D’agostino G., Giambra B., Bosi A., Ripanti F., Nucara A., Postorino P., Curini R., Bruno M. (2021). Dyes of a shadow theatre: Investigating tholu bommalu indian puppets through a highly sensitive multi-spectroscopic approach. HERITAGE, vol. 4, p. 1807-1820, ISSN: 2571-9408, doi: 10.3390/HERITAGE4030101.