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Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones

2022-09Journal article Open access
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dc.contributor.authorSilva, Teresa
dc.contributor.authorDe Oliveira, Daniel Pipa Soares
dc.contributor.authorVeiga, JP
dc.contributor.authorLisboa, Jose
dc.contributor.authorCarvalho, Jorge
dc.contributor.authorBarreiros, M. Alexandra
dc.contributor.authorCoutinho, ML
dc.contributor.authorSalas-Colera, Eduardo
dc.contributor.authorVigário, Rogério
dc.date.accessioned2022-10-26T16:51:45Z
dc.date.available2022-10-26T16:51:45Z
dc.date.issued2022-09
dc.description.abstractABSTRACT: 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.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSilva, Teresa P... [et.al.] - Contribution to the Understanding of the Colour Change in Bluish-Grey Limestones. In: Heritage, 2022, vol. 5 (3), p. 1479-1503pt_PT
dc.identifier.doi10.3390/heritage5030078pt_PT
dc.identifier.issn2571-9408
dc.identifier.urihttp://hdl.handle.net/10400.9/3926
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationUIDB/50025/2020-2023pt_PT
dc.relationNot Available
dc.relationHERCULES Laboratory - Cultural Heritage, Studies and Safeguard
dc.relationHERCULES Laboratory - Cultural Heritage, Studies and Safeguard
dc.relation.publisherversionhttps://doi.org/10.3390/heritage5030078pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectBuilt heritagept_PT
dc.subjectOrnamental stonept_PT
dc.subjectDark limestonept_PT
dc.subjectBleachingpt_PT
dc.subjectIronpt_PT
dc.subjectXANESpt_PT
dc.titleContribution to the Understanding of the Colour Change in Bluish-Grey Limestonespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleNot Available
oaire.awardTitleHERCULES Laboratory - Cultural Heritage, Studies and Safeguard
oaire.awardTitleHERCULES Laboratory - Cultural Heritage, Studies and Safeguard
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/CEEC IND 2017/CEECIND%2F00349%2F2017%2FCP1431%2FCT0004/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04449%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04449%2F2020/PT
oaire.citation.endPage1503pt_PT
oaire.citation.startPage1479pt_PT
oaire.citation.titleHeritagept_PT
oaire.citation.volume5pt_PT
oaire.fundingStreamCEEC IND 2017
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNameSilva
person.familyNamede Oliveira
person.familyNameVeiga
person.familyNameLisboa
person.familyNameCarvalho
person.familyNameBarreiros
person.familyNameLarsson D. Coutinho
person.givenNameTeresa
person.givenNameDaniel Pipa Soares
person.givenNameJoão Pedro
person.givenNameJose
person.givenNameJorge
person.givenNameMaria Alexandra
person.givenNameMathilda
person.identifier2216267
person.identifierL-4674-2014
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person.identifier.orcid0000-0001-5324-1586
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person.identifier.orcid0000-0001-7055-5907
person.identifier.orcid0000-0002-0132-4969
person.identifier.orcid0000-0002-3802-1363
person.identifier.ridL-9359-2013
person.identifier.ridJ-3681-2013
person.identifier.ridC-7044-2013
person.identifier.scopus-author-id7005146574
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person.identifier.scopus-author-id6603680496
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project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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