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- W2023244051 abstract "► Laser irradiation of pigments studied using different wavelengths and pulse duration. ► Vermilion was discolored due to the transformation of the allotropic phase from α -HgS to β -HgS form. ► Lead chromate discolored following reduction process of chromium. ► Malachite discolored following reduction process of copper. ► The induced modifications were attenuated when using shorter pulses in UV region. 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." @default.
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- W2023244051 date "2013-02-01" @default.
- W2023244051 modified "2023-10-16" @default.
- W2023244051 title "Wavelength and pulse duration effects on laser induced changes on raw pigments used in paintings" @default.
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- W2023244051 doi "https://doi.org/10.1016/j.saa.2012.10.001" @default.
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