Gold nanoparticles in painted miniatures on ivory: Non-invasive evidence and characterisation

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461446%3A_____%2F22%3AN0000017" target="_blank" >RIV/60461446:_____/22:N0000017 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.dyepig.2022.111015" target="_blank" >https://doi.org/10.1016/j.dyepig.2022.111015</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.dyepig.2022.111015" target="_blank" >10.1016/j.dyepig.2022.111015</a>

Result language
angličtina
Original language name
Gold nanoparticles in painted miniatures on ivory: Non-invasive evidence and characterisation
Original language description
To document the use of gold nanoparticles (also known as ˝Purple of Cassius˝ pigment) in miniature painting; seven 19th century portraits from Czech collections containing purple colour were studied. The research was performed non-invasively; as it was not possible to sample the small-sized and delicate paintings. Large area X-ray fluorescence scanning indicated the presence of Purple of Cassius in four paintings; while in the three of them; the desired shade was achieved by mixing red and blue pigments; for example vermillion and Prussian blue. The detected gold nanoparticles were characterised in detail by X-ray powder diffraction and via innovative use of environmental scanning electron microscopy. The obtained diffraction patterns enabled the calculation of average size of the particles; which equalled to 8-14 nm. Based on available historical recipes; the pigment preparation was replicated in laboratory; yielding analogous pigment with similar particle size. For the first time; Purple of Cassius was identified and characterised in portrait miniatures.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10406 - Analytical chemistry

Project
<a href="/en/project/DG18P02OVV034" target="_blank" >DG18P02OVV034: Non-invasive research of portrait miniatures for the purpose of their dating, authentication, presentation and protection</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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