Investigating the Potential of the Er:YAG Laser for the Removal of Cemented Dust from Limestone and Painted Plaster
Source abstract
Abstract
A successful application of Er:YAG laser for the cleaning of a restored Assyrian relief sculpture from the British Museum collection is presented. Displayed in the gallery, the sculpture has darkened over time due to the natural deposition of dirt, in particular on restored parts. Since traditional cleaning methods have demonstrated to be unsuccessful, a scientific investigation was performed to identify the composition of the soiling and the materials used for the restoration. The analysis suggested the presence of gypsum, calcium oxalate, carbonates and alumino-silicates on the encrustation. The molded plaster, composed of lime and gypsum and pigmented aggregates, was likely prepared at the end of the 19th century to mimic the stone color. It was repainted with what was identified as a modern oil-based overpaint, applied to cover darkening during a second conservation treatment in the 20th century. Laser trials were first performed on small areas of the objects and on mock-ups to determine the critical fluence thresholds of the surface, investigated through visual examination and analyses using Fourier transform infrared spectroscopy (FTIR) and Pyrolysis-gas chromatography-mass spectrometry (Py–GC–MS). The right parameters and conditions to be used during the cleaning process were, therefore, determined. The chemical selectivity of the cleaning process allowed us to complete the treatment safely while preserving the restoration.
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Research context
OpenAlex topics: Cultural Heritage Materials Analysis · Building materials and conservation · Conservation Techniques and Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Scientific Research, The British Museum, Great Russell Street, London WC1B 3DG, UK
Department of Conservation, The British Museum, Great Russell Street, London WC1B 3DG, UK
Funding
Andrew W. Mellon Foundation
References (91)
Show source-provided references
1. Characterization of Laser Cleaning of Artworks10.3390/s8106507 ↗
2. Portoni, F., Perucchetti, L., Mak, S., and Cartwright, C. (2020, September 04). What Lurks under the Microscope? Dust Detective Work. Available online: https://blog.britishmuseum.org/what-lurks-under-the-microscope-dust-detective-work/.
3. Monitoring and Mitigating Particulate Matter Deposition on Decorative Surfaces: Current and Future Approaches in the Palace of Westminster10.1080/00393630.2018.1504515 ↗
4. Review of methods to collect settled dust and isolate culturable microorganisms10.1034/j.1600-0668.2001.110204.x ↗
5. Tarnowski, A.L., McNamara, C.J., Bearce, K.A., and Mitchell, R. (2004, January 8–13). Sticky microbes and dust on objects in historic houses. Proceedings of the 32nd Annual Meeting of the American Institute of Conservation (AIC), Portland, OR, USA.
6. Lithgow, K., Lloyd, H., Brimblecombe, P., Yoon, Y., and Thickett, D. (2005, January 12–16). Managing dust in historic houses—A visitor/conservator interface. Proceedings of the ICOM-CC, 14th Triennial Meeting Preprints, The Hague, The Netherlands.
7. The Influence of Water Activity and Air Movement in Preventing Mould in Historic Materials10.1080/00393630.2018.1471889 ↗
8. When the Dust Settles: Dust Monitoring in Exhibitions at the Victoria and Albert Museum
9. New Perspectives on the Study of Particulate Matter Deposition within Historic Interiors10.1080/00393630.2018.1503862 ↗
10. Fluid simulations in heritage science10.1186/s40494-019-0259-9 ↗
11. Laser cleaning in conservation of stone, metal, and painted artifacts: State of the art and new insights on the use of the Nd:YAG lasers10.1007/s00339-011-6690-8 ↗
12. Advances in laser cleaning of artwork and objects of historical interest: The optimized pulse duration approach10.1021/ar900190f ↗
13. Discoloration of marble during laser cleaning by Nd:YAG laser wavelengths10.1016/S0169-4332(00)00706-6 ↗
14. Dickmann, K., Fotakis, C., and Asmus, J.F. (2005). Lasers Cleaning of Patrimonial Plasters, Springer.
15. Bartoli, L., Pouli, P., Fotakis, C., Siano, S., and Salimbeni, R. (2006). Characterization of Stone Cleaning by Nd:YAG Lasers with Different Pulse Duration. Laser Chem., 2006.10.1155/2006/81750 ↗
16. Study of the laser cleaning on plaster sculptures. The effect of laser irradiation on the surfaces10.1134/S0030400X13060118 ↗
17. Removal of Verrucaria nigrescens from Carrara marble artefacts using Nd:YAG lasers: Comparison among different pulse durations and wavelengths10.1007/s00339-014-8933-y ↗
18. IR irradiation to remove a sub-aerial biofilm from granitic stones using two different laser systems: An Nd: YAG (1064 nm) and an Er:YAG (2940 nm)10.1016/j.scitotenv.2019.06.306 ↗
19. The laser as a tool for the cleaning of Cultural Heritage10.1088/1757-899X/364/1/012078 ↗
20. Siano, S. (2020, November 02). Multiple Temporal Regime Laser for Art Conservation. Available online: https://spie.org/news/4913-multiple-temporal-regime-laser-for-art-conservation#B3.
21. Nd:YAG laser effects on inorganic pigments10.1016/S1296-2074(00)00181-3 ↗
22. The effect of Nd:YAG laser radiation on medieval pigments10.1016/S1296-2074(00)00143-6 ↗
23. Discoloration of Pigments Induced by Laser Irradiation10.1179/026708401101517773 ↗
24. Multi-pulse laser irradiation of cadmium yellow paint films: The influence of binding medium and particle aggregates10.1016/j.measurement.2017.07.046 ↗
25. Radvan, R., Asmus, J., Castillejo, M., Pouli, P., and Nevin, A. (2010). Spectral analysis of the effects of laser wavelength and pulse duration on tempera paints. Lasers in the Conservation of Artworks: Proceedings of the International Conference LACONA VIII, Sibiu, Romania, 21–25 September 2009, CRC Press.10.1201/b10567 ↗
26. Yellowing of laser-cleaned artworks: Formation of residual hydrocarbon compounds after Nd:YAG laser cleaning of gypsum plates covered by lamp black10.1016/j.culher.2019.02.014 ↗
27. Brunetto, A. (2014, January 18–20). La tecnologia laser nella pulitura dei manufatti lapidei, casi studio a confronto. Proceedings of the Aplar 5, applicazioni laser nel restauro, Musei Vaticani, Vatican City State.
28. Targowski, P., Walczak, M., and Pouli, P. (2017). Laser yellowing effect: Study of the nanophases created by laser irradiation of synthetic black crusts using transmission electron microscopy (TEM) and electron paramagnetic resonance (EPR) spectroscopy. Proceedings of Lacona XI—Lasers in the Conservation of Artworks, Krakow, Poland, 20–23 September 2016, Nicolaus Copernicus University Press.
29. Nanoscale investigation by TEM and STEM-EELS of the laser induced yellowing10.1016/j.micron.2018.08.006 ↗
30. Overpaint removal from easel paintings using an LQS Nd:YAG laser: The first validation study10.1179/0039363015Z.000000000207 ↗
31. Targowski, P., Walczak, M., and Pouli, P. (2017). Easel paintings on canvas and panel: Application of Nd:YAG laser at 355 nm, 1064 nm and UV, IR and visible light for the development of new methodologies in conservation. Proceedings of Lacona XI—Lasers in the Conservation of Artworks, Krakow, Poland, 20–23 September 2016, Nicolaus Copernicus University Press.
32. The use of erbium lasers for the conservation of cultural heritage. A review10.1016/j.culher.2017.10.007 ↗
33. Introduction: Er:YAG lasers in the conservation of artworks10.1080/19455224.2019.1706597 ↗
34. L’esperienza dell’Opificio nella sperimentazione del laser ad erbio per la pulitura dei dipinti
35. Er:YAG laser cleaning of ‘San Marziale in Gloria’ by Jacopo Tintoretto in the Church of San Marziale, Venice10.1080/19455224.2019.1706596 ↗
36. A study on the heat distribution and oxidative modification of aged dammar films upon Er:YAG laser irradiation10.1080/19455224.2019.1707699 ↗
37. Radvan, R., Asmus, J., Castillejo, M., Pouli, P., and Nevin, A. (2010). Free-running Er: YAG laser cleaning of mural painting specimens treated with linseed oil, ‘Beverone’and Paraloid B72. Lasers in the Conservation of Artworks: Proceedings of the International Conference LACONA VIII, Sibiu, Romania, 21–25 September 2009, CRC Press.10.1201/b10567 ↗
38. Diagnosis of materials and effectiveness of Er:YAG laser cleaning as complementary treatment in a panel painting attributed to Lluís Borrassà (fifteenth century)10.1007/s00339-016-0100-1 ↗
39. Laser removal of contaminants from painted surfaces10.1016/S1296-2074(00)00182-5 ↗
40. De Cruz, A., Wolbarsht, M.L., Palmer, R.A., Pierce, S.E., and Adamkiewicz, E. (2005). Er:YAG Laser Applications on Marble and Limestone Sculptures with Polychrome and Patina Surfaces, Springer.
41. Investigation of the Er:YAG Laser at 2.94 μm to Remove Lichens Growing on Stone10.1179/sic.2009.54.4.268 ↗
42. Brunetto, A. (2017). La pulitura di un’urna romana con il laser Er:YAG a 2940 nm. Proceedings of Aplar 5, Applicazioni Laser Nel Restauro, Musei Vaticani, Vatican City State, 18–20 September 2014, Nardini Editore.
43. Pereira-Pardo, L., Camurcuoglu, D., Orsini, M., Vasiliou, S., Weglowska, K., Kiely, T., and Korenberg, C. (2019, January 5–7). The use of an Er:YAG Laser in the removal of biological growth from polychrome archaeological terracotta figurines from Cyprus. Proceedings of the Recent Advances in Glass and Ceramics Conservation—Interim Meeting of the ICOM-CC Working Group, The British Museum, London, UK.
44. Er:YAG laser cleaning of a marble Roman urn10.1080/19455224.2019.1706593 ↗
45. Tackling conservation challenges using erbium lasers: Case studies at the British Museum10.1080/19455224.2019.1706591 ↗
46. Castillejo, M., Moreno, P., Oujja, M., Radvan, R., and Ruiz, J. (2008). The interaction of laser radiation at 2.94 μm with azurite and malachite pigments. Lasers in the Conservation of Artworks, Proceedings of the International Conference Lacona VII, Madrid, Spain, 17–21 September 2007, CRC Press.
47. Multi analytical Study of Laser Pulse Duration Effects in the IR Laser Cleaning of Wall Paintings from the Monumental Cemetery of Pisa10.1155/2006/39046 ↗
48. Layard, A.H. (1849). Nineveh and Its Remains: With an Account of a Visit to the Chaldaean Christians of Kurdistan, and the Yezidis, Or Devil-worshippers, and an Enquiry Into the Manners and Arts of the Ancient Assyrians, John Murray. [1st ed.].
49. Gadd, C.J. (1934). The Assyrian Sculptures. By C. J. Gadd, Etc., British Museum. Order of the Trustees.
50. Gadd, C.J. (1936). The Stones of Assyria; the Surviving Remains of Assyrian Sculpture, Their Recovery, and Their Original Positions, Chatto and Windus.
51. Bonomi, J. (1852). Nineveh and Its Palaces: The Discoveries of Botta and Layard, Applied to the Elucidation of Holy Writ/By Joseph Bonomi, Office of the Illustrated London library. [2nd ed.].
52. Renouf, P.L.P. (1886). Assyrian Antiquities: Guide to the Nimroud Central Saloon, British Museum.
53. Fenton, R. (2020, February 19). The Assyrian Gallery, British Museum. Available online: http://www.getty.edu/art/collection/objects/146261/roger-fenton-the-assyrian-gallery-british-museum-english-about-1857-1859/?dz=0.3582,0.2490,5.41.
54. Photograph No 32. Frederick York Album (1875), The British Museum Archive.
55. Barnett, R.D., and Falkner, M. (1962). The Sculptures of Aššur-Nasir-Apli II, 883-859 B.C.: Tiglath-pileser III, 745–727 B.C. and Esarhaddon, 681–669 B.C. from the Central and South-West Palaces at Nimrud, Trustees of the British Museum.
56. Historical plasterwork techniques inspire new formulations10.1016/j.conbuildmat.2013.07.064 ↗
57. Angelova, L.V., Ormsby, B., Townsend, J., and Wolbers, R. (2017). The removal of lead-and oil-based overpaint from a plaster cast of Hermes Fastening his Sandal. Gels in the Conservation of Art, Archetype Publications.
58. Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime10.1007/s10853-012-6535-7 ↗
59. FTIR techniques in clay mineral studies10.1016/S0924-2031(02)00065-6 ↗
60. Library of FT-Raman spectra of pigments, minerals, pigment media and varnishes, and supplement to existing library of Raman spectra of pigments with visible excitation10.1016/S1386-1425(00)00495-9 ↗
61. Pigment study by Raman microscopy of 23 paintings by the Portuguese artist Henrique Pousão (1859–1884)10.1002/jrs.1786 ↗
62. Raman study of different crystalline forms of PbCrO4 and PbCr1−xSxO4 solid solutions for the noninvasive identification of chrome yellows in paintings: A focus on works by Vincent van Gogh10.1002/jrs.4548 ↗
63. Degradation Process of Lead Chromate in Paintings by Vincent van Gogh Studied by Means of Synchrotron X-ray Spectromicroscopy and Related Methods. 1. Artificially Aged Model Samples10.1021/ac102424h ↗
64. Chromium speciation methods and infrared spectroscopy for studying the chemical reactivity of lead chromate-based pigments in oil medium10.1016/j.microc.2015.08.028 ↗
65. Black layers on historical architecture10.1007/s11356-008-0046-8 ↗
66. Brownish alterations on the marble statues in the church of Orsanmichele in Florence: What is their origin?10.1186/s40494-015-0038-1 ↗
67. An interdisciplinary approach to a knowledge-based restoration: The dark alteration on Matera Cathedral (Italy)10.1016/j.apsusc.2018.07.101 ↗
68. The Conservation of Marble Sculptures in the British Museum Before 197510.1179/sic.2002.47.3.145 ↗
69. Raman spectroscopy as a means for the identification of plattnerite (PbO), of lead pigments and of their degradation products10.1039/b008302j ↗
70. Analysis of the laser-induced reduction mechanisms of medieval pigments10.1016/S0169-4332(00)00909-0 ↗
71. Laser irradiation of medieval pigments at IR, VIS and UV wavelengths10.1016/S1296-2074(02)01206-2 ↗
72. Laser-induced degradation of lead pigments with reference to Botticelli’s Trionfo d’Amore10.1016/S0003-2670(01)01053-4 ↗
73. Analysis of the laser-induced discoloration of lead white pigment10.1016/S0169-4332(02)00499-3 ↗
74. Non-invasive identification of paint binders in illuminated manuscripts by ER-FTIR spectroscopy: A systematic study of the influence of different pigments on the binders’ characteristic spectral features10.1186/s40494-019-0249-y ↗
75. The drying of linseed oil investigated by Fourier transform infrared spectroscopy: Historical recipes and influence of lead compounds10.1016/j.porgcoat.2015.12.010 ↗
76. A molecular study of modern oil paintings: Investigating the role of dicarboxylic acids in the water sensitivity of modern oil paints10.1039/C7RA13364B ↗
77. Attenuated total reflection micro FTIR characterisation of pigment–binder interaction in reconstructed paint films10.1007/s00216-008-2126-5 ↗
78. Lead soaps in paintings: Friends or foes?10.1080/00393630.2016.1232529 ↗
79. Colombini, M.P., and Modugno, F. (2009). Py-GC/MS of Organic Paint Binders. Organic Mass Spectrometry in Art and Archaeology, Wiley.10.1002/9780470741917 ↗
80. A GC-MS study on the deterioration of lipidic paint binders10.1016/S0026-265X(02)00062-0 ↗
81. The characterisation of lead fatty acid soaps in ‘protrusions’ in aged traditional oil paint10.1016/S0277-5387(03)00461-3 ↗
82. An investigation into the curing of urushi and tung oil films by thermoanalytical and mass spectrometric techniques10.1016/j.polymdegradstab.2016.10.015 ↗
83. A comparison study of alkyd resin used in art works by Py-GC/MS and GC/MS: The influence of aging10.1016/j.jaap.2013.05.028 ↗
84. Analytical Strategies for Characterizing Organic Paint Media Using Gas Chromatography/Mass Spectrometry10.1021/ar900185f ↗
85. Colombini, M.P., and Modugno, F. (2009). Py-GC/MS of Natural and Synthetic Resins. Organic Mass Spectrometry in Art and Archaeology, Wiley.10.1002/9780470741917 ↗
86. Oxidative crosslinking of alkyd resins studied with mass spectrometry and NMR using model compounds10.1007/BF02720501 ↗
87. van den Berg, K.J., Burnstock, A., de Keijzer, M., Krueger, J., Learner, T., Tagle, d.A., and Heydenreich, G. (2014). Modern Oil Paints—Formulations, Organic Additives and Degradation: Some Case Studies. Issues in Contemporary Oil Paint, Springer International Publishing.10.1007/978-3-319-10100-2 ↗
88. The role of the polymeric network in the water sensitivity of modern oil paints10.1038/s41598-019-39963-z ↗
89. On the influence of relative humidity on the oxidation and hydrolysis of fresh and aged oil paints10.1038/s41598-019-41893-9 ↗
90. Burnstock, A., and Van den Berg, K.J. (2014). Twentieth Century Oil Paint. The Interface Between Science and Conservation and the Challenges for Modern Oil Paint Research. Issues in Contemporary Oil Paint, Springer International Publishing.10.1007/978-3-319-10100-2_1 ↗
91. Scientific investigation into the water sensitivity of twentieth century oil paints10.1016/j.microc.2018.01.017 ↗