AI Article Synopsis
- The study examined how common artist's pigments like vermilion, lead chromate, and malachite react to various laser treatments in terms of wavelength and pulse duration.
- The pigments underwent different physicochemical changes, such as a change in crystalline structure for vermilion, while lead chromate and malachite experienced reduction processes.
- Ultraviolet ultrashort laser pulses resulted in fewer changes compared to infrared pulses, leading to suggestions for improved laser cleaning techniques to limit discoloration in painted artwork.
Article Abstract
In this study, the reaction of widely used artist's pigments in raw form to pulsed laser radiation of different wavelengths and pulse duration was investigated. Vermilion, lead chromate and malachite (in the form of pellets) were irradiated using laser pulses of 500 fs at 248 nm, and pulses of 150 ps and 15 ns at 1064 and 213 nm. Optical microscopy, colorimetry, spectrofluorimetry, micro-Raman spectroscopy and X-ray photoelectron spectroscopy were employed to characterize the physicochemical changes induced to the pigments. Change of crystalline phase was identified for vermilion while reduction processes take place for lead chromate and malachite. It was found that these effects were minimized by application of ultraviolet ultrashort pulses (of femtosecond and picosecond duration) as compared with changes occurring by pulsed infrared irradiation (of both picosecond and nanosecond duration). The results presented are discussed in relation to previous research on painted mock-ups in order to elucidate the role and significance of the binding media in the laser induced discoloration of painted surfaces and thus to propose optimum laser cleaning practices.
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| http://dx.doi.org/10.1016/j.saa.2012.10.001 | DOI Listing |
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