89 research outputs found
El Retrato de Margarita van Eyck de Jan van Eyck: nuevas im\ue1genes del Proyecto VERONA (Van Eyck Research in OpeN Access)
Plumbonacrite identified by X-ray powder diffraction tomography as a missing link during degradation of red lead in a Van Gogh painting
Red lead, a semiconductor pigment used by artists since antiquity, is known to undergo several discoloration phenomena. These transformations are either described as darkening of the pigment caused by the formation of either plattnerite (β‐PbO) or galena (PbS) or as whitening by which red lead is converted into anglesite (PbSO) or (hydro)cerussite (2 PbCO⋅Pb(OH); PbCO). X‐ray powder diffraction tomography, a powerful analytical method that allows visualization of the internal distribution of different crystalline compounds in complex samples, was used to investigate a microscopic paint sample from a Van Gogh painting. A very rare lead mineral, plumbonacrite (3 PbCO⋅ Pb(OH)⋅PbO), was revealed to be present. This is the first reported occurrence of this compound in a painting dating from before the mid 20th century. It constitutes the missing link between on the one hand the photoinduced reduction of red lead and on the other hand (hydro)cerussite, and thus sheds new light on the whitening of red lead
In situ Macro X-Ray Fluorescence (MA-XRF) imaging visualizes a scene below van Dyck\u2019s earliest self-portrait
Helena Fourment further uncovered : a new interpretation of \u2018Het Pelsken\u2019 based on recent analytical imaging
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