4.2 Article

How to distinguish red coloring matter used in prehistoric time? The contribution of visible near-infrared diffuse reflectance spectroscopy

Journal

COLOR RESEARCH AND APPLICATION
Volume 46, Issue 3, Pages 653-673

Publisher

WILEY
DOI: 10.1002/col.22647

Keywords

diffuse reflectance; prehistory; red coloring matter; rock art; visible‐ infrared spectra

Funding

  1. Europlanet 2024 RI programme, European Union's Horizon 2020 research and innovat [654208]
  2. Archaeological Service of the Auvergne-Rhone-Alpes region, PCR Pigmentotheque
  3. Universite Savoie-MontBlanc: MASCARA project (2017)
  4. Universite Savoie-MontBlanc: MASCARA project (2018)
  5. Universite Savoie-MontBlanc: TRAnSFeRT project (2019)

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Although red is the main color used in prehistoric paintings, there is a wide variety of red coloring matter in prehistory, which may have undergone various preparations, mixtures, or alterations. Using spectro-radiometry, it is possible to distinguish different coloring materials based on their spectral signature and understand the relationship with their mineral composition.
Although the main prehistoric color used for paintings is red, knowledge of this coloring matter often boils down to saying that it is ochre. However, the red coloring matter of Prehistory is numerous and may have been the subject of various preparations, mixtures, or even alterations. Understanding the use and transformation of coloring matter raises questions about the technical processes but also about the supply strategies of these ancient societies. In the case of analysis of solid archaeological remains, we can access the petrography, mineralogy and chemistry of these ferruginous rocks. But, when it is about deposited powder, the means of investigation become limited. We therefore propose to test the complementarity of spectro-radiometry, a non-invasive method that allows us to obtain a spectral signature of the material whatever its mode of preparation. From six geological reference samples chosen for their color (from red to yellow) and for their mineralogical composition, spectra in the visible and near-infrared were recorded under several experimental conditions and several modes of preparation of the matter, using two spectro-gonio radiometers. It is then possible to discriminate these different coloring matter on the basis of their spectral signature and to understand the link with their mineral composition.

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