Laser cleaning of artificially soiled cotton fabric: Assessment of surface chemical effects

The effectiveness of the cleaning methods to remove soiling and stains from fabric artefacts is often limited by their complex microscopic and macroscopic structures, including fibre bundles, warp, weft, narrow folds, sewing deformations, and others. These structures may sometimes make the complete fabric cleaning very challenging, and they can easily be damaged. To approach such a problem, the potential of pulsed laser treatments of artificially soiled cotton fabrics has been investigated. Laser tests were carried out on the following samples: (i) untreated cotton fabric, (ii) unaged-sized cotton fabric, and (iii) aged-sized cotton fabric with soiling. Moreover, vacuum cleaning was also considered prior to laser irradiations to evaluate whether standard treatments can favour a more effective laser cleaning treatment. The fun-damental wavelength and second harmonics of a Q-Switched Nd:YAG laser (1,064,532 nm) were used for the experimentation. The morphology and chemical composition of the laser irradiated mock-ups were characterised through a multi-analytical approach, including Fibre Optic Reflectance Spectroscopy (FORS), colourimetry, optical microscopy, Diffuse reflectance-FTIR (DR-FTIR) spectroscopy, mu-Raman spectroscopy and X-ray fluorescence spectroscopy (XRF). Contrarily to what was reported in some literature, these analyses allowed to demonstrate the absence of any chemical change of the cellulose fibres and the possibility to optimise the laser parameters in order to achieve satisfactory and non-invasive laser cleaning results.(c) 2023 The Authors. Published by Elsevier Masson SAS on behalf of Consiglio Nazionale delle Ricerche (CNR).This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )

Automated summary

The complex structures of fabric artifacts, such as fiber bundles, warps, wefts, and folds, can limit the effectiveness of cleaning methods. Pulsed laser treatments show potential for effectively and non-invasively cleaning artificially soiled cotton fabrics.