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Deciphering hidden layers's images through terahertz spectral fingerprints.

Candida Moffa1, Daniele Francescone1, Alessandro Curcio1

  • 1Department of Basic and Applied Sciences for Engineering (SBAI), Sapienza, University of Rome, Via Antonio Scarpa, 16, Rome, 00161, Italy.

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Summary

Terahertz (THz) multispectral imaging non-destructively analyzes layered artworks. This technology reveals hidden text and maps pigment composition, unlocking secrets within cultural heritage artifacts.

Keywords:
Hidden layersImagingMappingPigmentsStratigraphyTerahertz

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Area of Science:

  • Art Conservation Science
  • Materials Science
  • Imaging Technology

Background:

  • Layered artworks present challenges for non-destructive analysis.
  • Understanding subsurface details and material composition is crucial for cultural heritage preservation.

Purpose of the Study:

  • To demonstrate the capability of Terahertz (THz) multispectral imaging for analyzing layered cultural heritage materials.
  • To reveal concealed information, such as text, beneath pictorial layers.
  • To map pigment composition for chemical characterization.

Main Methods:

  • Utilized THz multispectral imaging for depth-resolved analysis.
  • Employed frequency-domain analysis to reconstruct hidden narratives at varying depths.
  • Applied imaging to mock-up layered artworks with concealed text and known pigment compositions.

Main Results:

  • Successfully revealed concealed text beneath multiple pictorial layers.
  • Demonstrated depth-resolved reconstruction of hidden information.
  • Provided accurate mapping of pigment composition, offering chemical insights.
  • Validated THz imaging's ability to penetrate and differentiate stratified materials.

Conclusions:

  • THz multispectral imaging is a powerful, non-destructive tool for cultural heritage analysis.
  • This technique can uncover hidden narratives and characterize materials within complex layered structures.
  • It offers significant potential for the examination and preservation of valuable artifacts.