Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.9/3926 |
Resumo: | ABSTRACT: Bluish-grey limestones have been extensively used as ornamental stones for decoration purposes in buildings, as well as in works of art, and accordingly, have been the target of intense exploration. In Portugal, the Jurassic limestone massif known as the Macico Calcario Estremenho (MCE), has been the source of grey-coloured ornamental stones, namely the Azul Valverde (one of the most well-known bluish-grey limestones) and Atlantic Blue varieties, both of which may undergo colour changes in outdoor environments. In this sense, it is important to understand the sudden colour change from bluish-grey to yellow/beige in the same limestone block in a quarry, or even, what happens to the colour when polished limestone is placed outdoors. This study was undertaken using various techniques, namely XRF (X-ray fluorescence spectrometry), XRD (X-ray diffraction), SEM (scanning electron microscopy), DTA-TG (differential thermal analysis/thermogravimetry) and colourimetry. Synchrotron radiation was also used at the European Synchrotron Radiation Facility (ESRF, Grenoble, France) where XANES (X-ray Absorption Near Edge Structure) spectra at Fe K-edge were collected to ascertain the speciation state of Fe in different coloured zones of the limestone, previously checked by EDXRF (energy dispersive X-ray fluorescence). The presence of Fe2+ and Fe3+ are responsible for the greyish and yellow/brown colour, respectively. On the other hand, the UV radiation from the sun causes a quickened and severe bleaching/fading on the dark blue/grey polished limestone. |
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Contribution to the Understanding of the Colour Change in Bluish-Grey LimestonesBuilt heritageOrnamental stoneDark limestoneBleachingIronXANESABSTRACT: Bluish-grey limestones have been extensively used as ornamental stones for decoration purposes in buildings, as well as in works of art, and accordingly, have been the target of intense exploration. In Portugal, the Jurassic limestone massif known as the Macico Calcario Estremenho (MCE), has been the source of grey-coloured ornamental stones, namely the Azul Valverde (one of the most well-known bluish-grey limestones) and Atlantic Blue varieties, both of which may undergo colour changes in outdoor environments. In this sense, it is important to understand the sudden colour change from bluish-grey to yellow/beige in the same limestone block in a quarry, or even, what happens to the colour when polished limestone is placed outdoors. This study was undertaken using various techniques, namely XRF (X-ray fluorescence spectrometry), XRD (X-ray diffraction), SEM (scanning electron microscopy), DTA-TG (differential thermal analysis/thermogravimetry) and colourimetry. Synchrotron radiation was also used at the European Synchrotron Radiation Facility (ESRF, Grenoble, France) where XANES (X-ray Absorption Near Edge Structure) spectra at Fe K-edge were collected to ascertain the speciation state of Fe in different coloured zones of the limestone, previously checked by EDXRF (energy dispersive X-ray fluorescence). The presence of Fe2+ and Fe3+ are responsible for the greyish and yellow/brown colour, respectively. On the other hand, the UV radiation from the sun causes a quickened and severe bleaching/fading on the dark blue/grey polished limestone.MDPIRepositório do LNEGSilva, TeresaDe Oliveira, Daniel Pipa SoaresVeiga, JPLisboa, JoseCarvalho, JorgeBarreiros, M. AlexandraCoutinho, MLSalas-Colera, EduardoVigário, Rogério2022-10-26T16:51:45Z2022-092022-09-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/3926engSilva, Teresa P... [et.al.] - Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones. In: Heritage, 2022, vol. 5 (3), p. 1479-15032571-940810.3390/heritage5030078info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-08-13T06:26:53Zoai:repositorio.lneg.pt:10400.9/3926Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:14:09.038833Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones |
title |
Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones |
spellingShingle |
Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones Silva, Teresa Built heritage Ornamental stone Dark limestone Bleaching Iron XANES |
title_short |
Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones |
title_full |
Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones |
title_fullStr |
Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones |
title_full_unstemmed |
Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones |
title_sort |
Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones |
author |
Silva, Teresa |
author_facet |
Silva, Teresa De Oliveira, Daniel Pipa Soares Veiga, JP Lisboa, Jose Carvalho, Jorge Barreiros, M. Alexandra Coutinho, ML Salas-Colera, Eduardo Vigário, Rogério |
author_role |
author |
author2 |
De Oliveira, Daniel Pipa Soares Veiga, JP Lisboa, Jose Carvalho, Jorge Barreiros, M. Alexandra Coutinho, ML Salas-Colera, Eduardo Vigário, Rogério |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
Repositório do LNEG |
dc.contributor.author.fl_str_mv |
Silva, Teresa De Oliveira, Daniel Pipa Soares Veiga, JP Lisboa, Jose Carvalho, Jorge Barreiros, M. Alexandra Coutinho, ML Salas-Colera, Eduardo Vigário, Rogério |
dc.subject.por.fl_str_mv |
Built heritage Ornamental stone Dark limestone Bleaching Iron XANES |
topic |
Built heritage Ornamental stone Dark limestone Bleaching Iron XANES |
description |
ABSTRACT: Bluish-grey limestones have been extensively used as ornamental stones for decoration purposes in buildings, as well as in works of art, and accordingly, have been the target of intense exploration. In Portugal, the Jurassic limestone massif known as the Macico Calcario Estremenho (MCE), has been the source of grey-coloured ornamental stones, namely the Azul Valverde (one of the most well-known bluish-grey limestones) and Atlantic Blue varieties, both of which may undergo colour changes in outdoor environments. In this sense, it is important to understand the sudden colour change from bluish-grey to yellow/beige in the same limestone block in a quarry, or even, what happens to the colour when polished limestone is placed outdoors. This study was undertaken using various techniques, namely XRF (X-ray fluorescence spectrometry), XRD (X-ray diffraction), SEM (scanning electron microscopy), DTA-TG (differential thermal analysis/thermogravimetry) and colourimetry. Synchrotron radiation was also used at the European Synchrotron Radiation Facility (ESRF, Grenoble, France) where XANES (X-ray Absorption Near Edge Structure) spectra at Fe K-edge were collected to ascertain the speciation state of Fe in different coloured zones of the limestone, previously checked by EDXRF (energy dispersive X-ray fluorescence). The presence of Fe2+ and Fe3+ are responsible for the greyish and yellow/brown colour, respectively. On the other hand, the UV radiation from the sun causes a quickened and severe bleaching/fading on the dark blue/grey polished limestone. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-10-26T16:51:45Z 2022-09 2022-09-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.9/3926 |
url |
http://hdl.handle.net/10400.9/3926 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Silva, Teresa P... [et.al.] - Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones. In: Heritage, 2022, vol. 5 (3), p. 1479-1503 2571-9408 10.3390/heritage5030078 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
MDPI |
publisher.none.fl_str_mv |
MDPI |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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