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Unveiling the Colours of Cellulose Nitrate Black and White Film-based Negatives in Colonial Photography

2020-02-17Artigo científico Acesso aberto
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dc.contributor.authorRoldão, Élia
dc.contributor.authorParola, A. Jorge
dc.contributor.authorVilarigues, Márcia
dc.contributor.authorLavédrine, Bertrand
dc.contributor.authorRamos, Ana Maria
dc.contributor.institutionDCR - Departamento de Conservação e Restauro
dc.contributor.institutionDQ - Departamento de Química
dc.contributor.institutionLAQV@REQUIMTE
dc.contributor.institutionVICARTE - Vidro e Cerâmica para as Artes
dc.contributor.pblEarthscan
dc.date.accessioned2020-05-13T22:43:58Z
dc.date.available2022-03-18T01:31:25Z
dc.date.embargoedUntil2021-02-17
dc.date.issued2020-02-17
dc.descriptionERDF/PT2020/POCI-01-0145-FEDER-007265; Project - PTDC/IVC-HFC/5174/2014; NEMOSINE project by European Union (EU)
dc.description.abstractAiming at contributing to the preservation of black and white (B&W) film-based negatives held by Portuguese archives, four photographic collections from the first half of the twentieth century were selected for study. During the macro assessment of the collections the preservation condition and hues found in photographic negatives from the Elmano Cunha e Costa (ECC) were noticed, distinguishing this collection from the remaining ones. Additional attention was given considering that the ECC collection was formed in a colonial context in the 1930s, while the others were formed on the Portugal mainland. The ECC collection results from an ethnographic survey of Angolan tribes recorded with B&W film-based negatives. In this collection, sets of negatives with pink, lemon yellow, greenish, orange brownish, and red brownish hues were found. To identify the origin of such hues, the image layer was analysed by microscale energy-dispersive X-ray fluorescence (μ EDXRF) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX). Additionally, to assess the base decay and its effect on the formation of hues, the plastic supports were characterized by Fourier transform infrared microscopy (μ FTIR). To complement the assessment of the film-base decay, pH was measured by using combined microelectrodes. The identification of mercury, iodine, chromium, and iron by μ EDXRF allowed correlation of the hues found in the negatives with chemical corrective treatments performed to improve the image quality. SEM-EDX confirmed those results and proved that the elements found were in the photographic emulsion layer. The results obtained are relevant since the hues identified may now be used as markers to indicate the technical work performed on colonial photography. Additionally, the visual and molecular assessment of the negatives’ supports (good to fair condition) allow proposing that the original storage conditions may have had a beneficial contribution to their present condition.en
dc.description.versionauthorsversion
dc.description.versionpublished
dc.format.extent1355070
dc.identifier.doi10.1080/00393630.2019.1662672
dc.identifier.issn0039-3630
dc.identifier.otherPURE: 15542151
dc.identifier.otherPURE UUID: 3ab0b8d9-bfd9-49d8-b113-bf6e0deef4ca
dc.identifier.otherScopus: 85073928120
dc.identifier.otherWOS: 000486753500001
dc.identifier.otherORCID: /0000-0002-1333-9076/work/65023400
dc.identifier.otherORCID: /0000-0002-9411-4150/work/65024666
dc.identifier.otherORCID: /0000-0002-6682-7620/work/212614642
dc.identifier.urihttp://hdl.handle.net/10362/97647
dc.identifier.urlhttps://www.scopus.com/pages/publications/85073928120
dc.language.isoeng
dc.peerreviewedyes
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/147218/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F72560%2F2010/PT
dc.relationBLACK AND WHITE: A STUDY ON THE AGEING AND CONSERVATION OF ACETATE AND NITRATE PHOTOGRAPHIC NEGATIVES IN PORTUGUESE COLLECTIONS
dc.relationPhysiologically Anchored Tools for Realistic nanOmateriaL hazard aSsessment
dc.subjectblack and white film-based negatives
dc.subjectimage corrective treatments
dc.subjectpH
dc.subjectPhotography
dc.subjectSEM-EDX
dc.subjectμ EDXRF
dc.subjectμ FTIR
dc.subjectConservation
dc.titleUnveiling the Colours of Cellulose Nitrate Black and White Film-based Negatives in Colonial Photographyen
dc.typejournal article
degois.publication.issue2
degois.publication.titleStudies in Conservation
degois.publication.volume65
dspace.entity.typePublication
oaire.awardNumberUID/QUI/50006/2013
oaire.awardNumberSFRH/BD/72560/2010
oaire.awardNumber760813
oaire.awardTitleBLACK AND WHITE: A STUDY ON THE AGEING AND CONSERVATION OF ACETATE AND NITRATE PHOTOGRAPHIC NEGATIVES IN PORTUGUESE COLLECTIONS
oaire.awardTitlePhysiologically Anchored Tools for Realistic nanOmateriaL hazard aSsessment
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FQUI%2F50006%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F72560%2F2010/PT
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/760813/EU
oaire.fundingStream5876
oaire.fundingStreamH2020
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameEuropean Commission
rcaap.rightsopenAccess
relation.isProjectOfPublicationb46f8ec0-8992-489c-89d9-54c4a065dc4a
relation.isProjectOfPublication682b74b1-b3c7-466f-846c-bfd61d898979
relation.isProjectOfPublicationa28d7e19-899b-4481-b29b-755126593ae1
relation.isProjectOfPublication.latestForDiscoveryb46f8ec0-8992-489c-89d9-54c4a065dc4a

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