A study of the effect of the wavelength in the Q-switched Nd:YAG laser cleaning of gilded wood |
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| Institution: | 1. Laboratorio di Risonanza Magnetica “Annalaura Segre”, Istituto di Metodologie Chimiche, Consiglio Nazionale delle Ricerche (IMC-CNR), Area della Ricerca di Roma 1, Via Salaria km 29,300, 00015 Monterotondo (Roma), Italy;2. Dipartimento di Scienze Farmaceutiche, Università di Perugia, via Fabbretti 48, 06123 Perugia, Italy;3. Istituto per i Polimeri, Compositi e Biomateriali, Consiglio Nazionale delle Ricerche (IPCB-CNR), Via Campi Flegrei, 34, 80078 Pozzuoli (Napoli), Italy;4. Dipartimento di Chimica e Centro SMAArt, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy |
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| Abstract: | The removal of a brass-based paint (purpurin) used in painting gilded wood to cover losses of gold leaf, represents today a difficult task to conservators, who may have to resort to toxic chemical solvents in order to clean the painted surface. This action, due to its nature, is unsuitable for both the conservator and the artwork itself. In this study, a Q-switched Nd:YAG laser system outputting 1 064 nm (infrared), 532 nm (visible, green) and 266 nm (ultra-violet) radiation was used to study the interaction of these wavelengths in a gilded sample surface painted with purpurin. All tested wavelengths interacted differently with the tested surface and, also, the several layers that form the gilded surface (purpurin, varnish and gold) showed different interactions to each wavelength. The ultra-violet radiation (266 nm), in a multi-pulse mode at low fluences, was found to be the most efficient wavelength in cleaning the painted gilded surface. |
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