Hidden pigments in portrait miniatures - purple of cassius

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461446%3A_____%2F20%3AN0000020" target="_blank" >RIV/60461446:_____/20:N0000020 - isvavai.cz</a>
Alternative codes found
RIV/60461446:_____/20:N0000017
Result on the web
<a href="https://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=16&SID=C1f7gecHNzvQoKOxtRs&page=1&doc=1" target="_blank" >https://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=16&SID=C1f7gecHNzvQoKOxtRs&page=1&doc=1</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Hidden pigments in portrait miniatures - purple of cassius
Original language description
The palettes used by miniature portrait artists included various inorganic and organic pigments. The first miniatures were executed on stretched vellum (parchment); later on, the variability of supports increased (paper, glass, metal, ivory). Watercolour and gouache were the most common techniques. In addition to pigments that did not differ in any way from those used by painters of larger paintings, there were also rarely used pigments, typically appearing just in the miniatures. In the literature, silver white or Purple of Cassius are mentioned, but there is a lack of their clear evidence in actual paintings. In this study, Purple of Cassius was identified in one French portrait miniature from the 19th century due to increased concentration of gold in purple shades of the painting. In addition, the production of Purple of Cassius was replicated combining historical recipes and classical laboratory methods. The applied procedure included dilution of a gold bar in aqua regia and reduction with powdered tin. The prepared pigment was characterized by confocal microscopy and scanning transmission electron microscopy (STEM) with energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) detectors in the bright field mode (BF).
Czech name
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Czech description
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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
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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