A non-invasive approach on textiles: identification of natural dyes through FORS and Hyperspectral imaging techniques

The present study focuses on the potentiality of a non-invasive approach for the identification of dyes on textiles. Twelve natural dyestuffs and three mordants were selected and combined to create a set of wool samples whose reflectance spectra, acquired using FORS technique, were the basis for a spectral database. The same set was used to test the Specim IQ hyperspectral camera, with positive results for a non-invasive investigation on wider areas. The application of Spectral Angle Mapping (SAM) gave the possibility to map directly on the image those pixel with similar spectral features. Finally, colorimetric data were acquired with a spectrocolorimeter to obtain chromaticity coordinates