Temperature-related degradation and colour changes of historic paintings containing vivianite

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F15%3A00442179" target="_blank" >RIV/61388980:_____/15:00442179 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985556:_____/15:00442179 RIV/00216208:11310/15:10292590

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.saa.2014.12.082" target="_blank" >http://dx.doi.org/10.1016/j.saa.2014.12.082</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.saa.2014.12.082" target="_blank" >10.1016/j.saa.2014.12.082</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Temperature-related degradation and colour changes of historic paintings containing vivianite

Popis výsledku v původním jazyce

Temperature-related degradation of pure synthetic as well as partly oxidised natural vivianite has been studied by high-temperature X-ray diffraction (HT-XRD) covering the whole extent of the temperature-related stability of its structure. While temperatures around 70°C are already damaging to vivianite, exposition to 160°C results in complete amorphisation of both the vivianite and its oxidation products. As indicated by Mossbauer spectroscopy, temperature-induced oxidation of vivianite starts at 90°C. To study the occurring structural as well as accompanying colour changes in more detail, model vivianite paint layer samples with different historic binders were prepared and subjected to increased temperatures. Exposition to 80°C caused pronounced colour changes of all the samples: ground natural blue vivianite became grey - a colour change which has been described in actual works of art. Regarding the binders, the oil seemed to facilitate the transfer of heat to vivianite's grains. To simulate conditions of conservation treatment under which the painting is exposed to increased temperatures, oil-on-canvas mock-ups with vivianite were prepared and relined in a traditional way using iron. The treatment affected preferentially larger grains of vivianite the micro-samples documented their change to grey, and their Raman spectra showed the change from vivianite to metavivianite.

Název v anglickém jazyce

Temperature-related degradation and colour changes of historic paintings containing vivianite

Popis výsledku anglicky

Temperature-related degradation of pure synthetic as well as partly oxidised natural vivianite has been studied by high-temperature X-ray diffraction (HT-XRD) covering the whole extent of the temperature-related stability of its structure. While temperatures around 70°C are already damaging to vivianite, exposition to 160°C results in complete amorphisation of both the vivianite and its oxidation products. As indicated by Mossbauer spectroscopy, temperature-induced oxidation of vivianite starts at 90°C. To study the occurring structural as well as accompanying colour changes in more detail, model vivianite paint layer samples with different historic binders were prepared and subjected to increased temperatures. Exposition to 80°C caused pronounced colour changes of all the samples: ground natural blue vivianite became grey - a colour change which has been described in actual works of art. Regarding the binders, the oil seemed to facilitate the transfer of heat to vivianite's grains. To simulate conditions of conservation treatment under which the painting is exposed to increased temperatures, oil-on-canvas mock-ups with vivianite were prepared and relined in a traditional way using iron. The treatment affected preferentially larger grains of vivianite the micro-samples documented their change to grey, and their Raman spectra showed the change from vivianite to metavivianite.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/GAP103%2F12%2F2211" target="_blank" >GAP103/12/2211: Zpracování multimodálních obrazových dat založené na matematických modelech optických vlastností barviv a jejich použití pro studium uměleckých děl</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

ISSN

1386-1425

e-ISSN

—

Svazek periodika

140

Číslo periodika v rámci svazku

APR

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

101-110

Kód UT WoS článku

000350939200012

EID výsledku v databázi Scopus

2-s2.0-84937107577