Non-invasive Analysis Unveils Secrets of the Alexander Mosaic

This PLOS ONE study employed non-invasive analytical techniques to thoroughly investigate the world-renowned Alexander Mosaic. Researchers used portable microscopy, infrared thermography, multispectral imaging, portable X-ray fluorescence, Fourier-transform infrared spectroscopy, and Raman spectroscopy to characterize the mosaic's constituent materials, mineral components, and old protective materials. Findings revealed the geological origins of ten colors used in the mosaic and provided crucial scientific insights for its restoration. The research highlights the immense potential of non-destructive analysis in cultural heritage preservation.