Complementary use of X-ray based imaging and analytical methods in the investigation of miniature portraits

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F20%3A00517273" target="_blank" >RIV/61388980:_____/20:00517273 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68081731:_____/20:00517273 RIV/60461446:_____/20:N0000005 RIV/60461446:_____/20:N0000023

Výsledek na webu

<a href="http://hdl.handle.net/11104/0305514" target="_blank" >http://hdl.handle.net/11104/0305514</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.microc.2019.104371" target="_blank" >10.1016/j.microc.2019.104371</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Complementary use of X-ray based imaging and analytical methods in the investigation of miniature portraits

Popis výsledku v původním jazyce

Miniature portraits are still little studied objects. One reason is that thin layers of detailed and very compact paintings do not allow any sampling. Another limitation is that non-invasive techniques must have sufficient spatial resolution and should be as gentle as possible as any surface change can be very noticeable. Usually, the surface of portrait miniatures is not coated with varnish, which is advantageous for the analysis, but at the same time there is a less protection and a higher risk of damage. In this work, three miniature portraits representing the three most important European schools English, French and Austrian have been investigated. They are all dated to the beginning of the 19th century, all painted in watercolour on ivory, which is the most common type of the support after 1700. Three innovative analytical approaches have been tested: large area X-ray fluorescence mapping (MA-XRF), X-ray micro-diffraction (micro-XRD) and environmental scanning electron microscopy coupled with energy dispersive X-ray microanalysis (ESEM-EDS). EDS analysis of miniatures in ESEM was tested as an entirely new analytical procedure with using water vapour instead of nitrogen in the specimen chamber. When effectively combining the above-mentioned methods, partial overpaintings and retouchings or a later added signature have been described and localized. A very early use of zinc white (around 1800), a possible origin of Ni-depleted cobalt blue, and numerous manifestations of degradation of As pigments that led to the formation of secondary arsenates have been demonstrated.

Název v anglickém jazyce

Complementary use of X-ray based imaging and analytical methods in the investigation of miniature portraits

Popis výsledku anglicky

Miniature portraits are still little studied objects. One reason is that thin layers of detailed and very compact paintings do not allow any sampling. Another limitation is that non-invasive techniques must have sufficient spatial resolution and should be as gentle as possible as any surface change can be very noticeable. Usually, the surface of portrait miniatures is not coated with varnish, which is advantageous for the analysis, but at the same time there is a less protection and a higher risk of damage. In this work, three miniature portraits representing the three most important European schools English, French and Austrian have been investigated. They are all dated to the beginning of the 19th century, all painted in watercolour on ivory, which is the most common type of the support after 1700. Three innovative analytical approaches have been tested: large area X-ray fluorescence mapping (MA-XRF), X-ray micro-diffraction (micro-XRD) and environmental scanning electron microscopy coupled with energy dispersive X-ray microanalysis (ESEM-EDS). EDS analysis of miniatures in ESEM was tested as an entirely new analytical procedure with using water vapour instead of nitrogen in the specimen chamber. When effectively combining the above-mentioned methods, partial overpaintings and retouchings or a later added signature have been described and localized. A very early use of zinc white (around 1800), a possible origin of Ni-depleted cobalt blue, and numerous manifestations of degradation of As pigments that led to the formation of secondary arsenates have been demonstrated.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10406 - Analytical chemistry

Projekt

<a href="/cs/project/DG18P02OVV034" target="_blank" >DG18P02OVV034: Neinvazivní výzkum portrétních miniatur pro účely jejich datace, autentikace, prezentace a ochrany</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Microchemical Journal

ISSN

0026-265X

e-ISSN

—

Svazek periodika

153

Číslo periodika v rámci svazku

MAR

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

104371

Kód UT WoS článku

000514218800023

EID výsledku v databázi Scopus

2-s2.0-85075355960