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Communication Dans Un Congrès Année : 2020

Modelling and IR thermal monitoring of the laser reconversion of blackened pigments

Résumé

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
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Dates et versions

hal-03690448 , version 1 (18-07-2022)

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  • HAL Id : hal-03690448 , version 1

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Victor de Seauve, Alexandre Semerok, Olivier Grauby, Vincent Detalle, Jean-Marc Vallet. Modelling and IR thermal monitoring of the laser reconversion of blackened pigments. AIC 2020 congress Natural colours - digital colours, Centre Français de la Couleur (CFC), Nov 2020, Avignon, France. ⟨hal-03690448⟩
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