Tessera 81. Erotes Mosaic, Marroquíes Altos (Jaén, Spain)

Black tessera from the Erotes mosaic of Marroquíes Altos (Jaén, Spain). It is made of glass. XRF analysis shows that the tessera contains a significant amount of Fe, suggesting that iron was responsible for the development of its black color under reducing conditions. In this environment, Fe changes from its ferric state (Fe³⁺) to its ferrous state (Fe²⁺). Ferrous ions act as efficient chromophores, absorbing parts of the visible spectrum and causing reflected or transmitted light to appear black.
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Dimensions

: 1 Centimeters

: 1 Centimeters

Materials

glass paste

Temporal

: Roman

: 2nd-4th AD

Otros metadatos

Spatial

  • : Marroquíes Altos, Erores Mosaic
  • : Jaén, Spain
  • : WGS84
 

Copyrights

Creative Commons - Attribution, Non-Commercial, No Derivatives (BY-NC-ND)

References

Blázquez, J.M. (1981): Mosaicos romanos de Córdoba, Jaén y Málaga. Madrid. Consejo Superior de Investigaciones Científicas.

Ortofoto del mosaico de los Erotes

Sánchez, A., Montejo, M., Tuñón, J. et al. (2026): Integrated portable spectroscopy for the analysis of Roman mosaics from Marroquíes Altos, Jaén, Spain. npj Heritage Science, 14, 55

Digital Resources

  • Tessera 81
    Creative Commons - Attribution, Non-Commercial, No Derivatives (BY-NC-ND)
    Arquiberlab
    http://creativecommons.org/licenses/by-nc-nd/3.0/
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  • Tessera 81 in the boat
    Creative Commons - Attribution, Non-Commercial, No Derivatives (BY-NC-ND)
    Arquiberlab
    http://creativecommons.org/licenses/by-nc-nd/3.0/
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  • Erotes Mosaic
    Creative Commons - Attribution, Non-Commercial, No Derivatives (BY-NC-ND)
    Arquiberlab
    http://creativecommons.org/licenses/by-nc-nd/3.0/
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  • IUIAI-UJA (pdf file)
    Creative Commons - Attribution, Non-Commercial, No Derivatives (BY-NC-ND)
    Arquiberlab
    http://creativecommons.org/licenses/by-nc-nd/3.0/
    [ver más...] [ver menos]
  • IUIAI-UJA
    Creative Commons - Attribution, Non-Commercial, No Derivatives (BY-NC-ND)
    Arquiberlab
    http://creativecommons.org/licenses/by-nc-nd/3.0/
    [ver más...] [ver menos]

Activities

  • Archaeometric analysis
  • Physical-chemical analysis
  • Tessera. Composition analysis

University Research Center for Iberian Archaeology

X-Ray Fluorescence

Elemental analysis

Non destructive. Surface cleaning. Sample pretreatment is not required. Direct measurement.

Portable Olympus Innov-X Delta Premium X-ray fluorescence spectrometer equipped with a rhodium (Rh) anode X-ray tube and a 20 mm2 SDD detector. An aluminum (Al) filter was applied to measure high-Z elements (from Fe onward) using a voltage of 40 kV and a current of 38.7 µA. Without filtering (low-Z elements), a voltage of 10 kV and a current of 50.8 µA can be applied. Measurements were performed in air for 150 s. The X-ray excitation beam was collimated through a window with dimensions of 3×3 mm2
 

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