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Discovering Hidden Painted Images: Subsurface Imaging Using Microscale Spatially Offset Raman Spectroscopy.

Alessandra Botteon1, Claudia Conti1, Marco Realini1

  • 1Consiglio Nazionale delle Ricerche, Istituto per la Conservazione e la Valorizzazione dei Beni Culturali (ICVBC) , Via Cozzi 53, 20125, Milano, Italy.

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Summary

Micro-spatially offset Raman spectroscopy (micro-SORS) can now map hidden layers beneath opaque materials. This noninvasive technique visualizes subsurface details previously undetectable, with applications in art conservation and beyond.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Cultural Heritage Science

Background:

  • Conventional Raman microscopy struggles to image sublayers through turbid materials.
  • Cultural heritage objects often have hidden or overpainted layers requiring noninvasive analysis.

Purpose of the Study:

  • To demonstrate the imaging capability of micro-spatially offset Raman spectroscopy (micro-SORS).
  • To showcase micro-SORS for noninvasively visualizing thin sublayers through highly turbid overlayers.

Main Methods:

  • Micro-spatially offset Raman spectroscopy (micro-SORS) was employed.
  • The technique was applied to recover overpainted images and reconstruct hidden writings.

Main Results:

  • Micro-SORS successfully mapped sublayers through turbid materials, visualizing previously hidden details.
  • The technique recovered overpainted images and reconstructed hidden writing through paper sheets.
  • Demonstrated noninvasive imaging of thin sublayers through highly turbid overlayers.

Conclusions:

  • Micro-SORS offers a novel noninvasive method for subsurface imaging.
  • The technique has significant potential in cultural heritage, forensics, polymers, and biological sciences.
  • Micro-SORS overcomes limitations of conventional Raman microscopy for turbid samples.