Deciphering hidden layers’s images through terahertz spectral fingerprints

Terahertz (THz) radiation enables non-destructive, depth-resolved analysis of layered artworks. This study demonstrates THz multispectral imaging’s ability to reveal concealed text beneath mock-up of pictorial layers, reconstructing hidden narratives at varying depths through frequency-domain analysis. Simultaneously, it maps pigment composition, providing valuable chemical information. Showcasing the power to penetrate and decipher stratified materials, this work establishes THz multispectral imaging as a crucial tool for unlocking hidden secrets and characterizing materials in Cultural Heritage artifacts.