Graphic vandalism: Multi-analytical evaluation of laser and chemical methods for the removal of spray paints.
In this work, we propose the laser-based cleaning with a Q-switched Nd:YAG laser (λ = 532 nm) not as a standalone methodology but rather in combination with chemical agents for the efficient removal vandal signs made with spray paints from marble substrates. The advantage of such approach is based o...
| Publicado en: | Journal of Cultural Heritage Vol. 44; pp. 260 - 275 |
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| Autores principales: | , , , , , |
| Formato: | Artículo |
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Elsevier B.V.
Jul2020
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=145035070&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 145035070 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 12962074 KK8 jtl: Journal of Cultural Heritage issn: 12962074 maglogo: N pubinfo: dt: Jul2020 vid: 44 pid: 467 pub: Elsevier B.V. artinfo: ui: 145035070 10.1016/j.culher.2020.01.007 ppf: 260 ppct: 15 formats: tig: atl: Graphic vandalism: Multi-analytical evaluation of laser and chemical methods for the removal of spray paints. aug: au: Giusti, Claudia Colombini, Maria Perla Lluveras-Tenorio, Anna La Nasa, Jacopo Striova, Jana Salvadori, Barbara affil: Department of Chemistry and Industrial Chemistry, University of Pisa, via Moruzzi 3, 56127, Pisa, Italy Institute of Heritage Science (CNR-ISPC), via Madonna del Piano 10, 50134 Sesto Fiorentino (FI), Italy National Institute of Optics, CNR-INO, Largo Fermi 6, 50125 Firenze, Italy su: Food aroma Spray painting Fourier transform infrared spectroscopy Antifouling paint Optical scanners Pulsed lasers Q-switched lasers Emulsion paint sug: subj: Food aroma Spray painting Fourier transform infrared spectroscopy Antifouling paint Optical scanners Pulsed lasers Q-switched lasers Emulsion paint keyword: Alkyd paint Cleaning efficacy and harmfulness Combined approach Graffiti, marble Laser cleaning Solvent cleaning ab: In this work, we propose the laser-based cleaning with a Q-switched Nd:YAG laser (λ = 532 nm) not as a standalone methodology but rather in combination with chemical agents for the efficient removal vandal signs made with spray paints from marble substrates. The advantage of such approach is based on the preliminary removal of the superficial paint by pulsed laser radiation so as to minimize the risk of the further colorant diffusion in the stone, caused by the solvent-based cleaning that is performed in the second step. The outcome was demonstrated on the removal of five aerosol paints (red, blue, black, green and yellow by Montana Colors 94), whose typology was chosen in agreement with the widespread use of this brand. The influence of substrate characteristics on the cleaning performance, such as roughness, porosity, and ageing of the paint, was investigated on fresh and aged paints on sound marble as well as on fresh paints on aged marble. Fresh and aged paints were characterized in terms of mineralogy and chemistry using X-ray diffraction (XRD), X-ray fluorescence (XRF), Pyrolysis-Gas Chromatography/Mass Spectrometry (Py-GC/MS), Gas/Chromatography/Mass spectrometry (GC/MS). The efficiency for single cleaning step and when applied in sequence was evaluated by colorimetric measurements, optical microscopy on surface and in cross section, XRF and reflection Fourier Transform Infrared spectroscopy (FTIR). Invasiveness of laser cleaning on sound marble was evaluated by Laser Scanner microprofilometry. The results converge in indicating the combined approach as a promising method where the preliminary thinning of the paint layer with laser ablation and the subsequent solvent action proved more efficient than the standalone approaches. The dependence of cleaning efficiency on the paint composition and ageing, as well as on the porosity of the stone, is also discussed. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2020 holdings: @attributes: islocal: N |
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