Modelling and IR thermal monitoring of the laser reconversion of blackened pigments
| Autor: | de Seauve, Victor, Semerok, Alexandre, Grauby, Olivier, Detalle, Vincent, Vallet, Jean-Marc |
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| Přispěvatelé: | Centre Interdisciplinaire de Conservation et Restauration du Patrimoine (CICRP), Ministère de la Culture et de la Communication (MCC), Service d'études analytiques et de réactivité des surfaces (SEARS), Département de Physico-Chimie (DPC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche et de restauration des musées de France (C2RMF), Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Centre Français de la Couleur (CFC) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | AIC 2020 congress Natural colours-digital colours AIC 2020 congress Natural colours-digital colours, Centre Français de la Couleur (CFC), Nov 2020, Avignon, France |
| Popis: | International audience; Some mural painting pigments tend to blacken with time due to their conversion to dark degradation products. An interesting approach of restauration involving continuous wave Nd:YAG lasers was suggested more than ten years ago, focusing on the reconversion of black plattnerite (β-PbO2) to red minium (Pb3O4). In the context of extending this approach to other pigments concerned by blackening (lead white and cinnabar), the laser heating of plattnerite was monitored by IR camera and modelled. An irradiance threshold (around 80 kW m-2) corresponding to the considered reaction temperature has been measured. A spectrocolorimetric study was conducted, which unravelled the reflectance changes occurring during the reconversion. Optical and thermal parameters of the plattnerite were measured or extrapolated to run the model. The latter was successful in reproducing the surface temperature evolution only in the first moments of the irradiation |
| Databáze: | OpenAIRE |
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