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On the Chemical Signature and Origin of Dicoppertrihydroxyformate (Cu2(OH)3HCOO) Formed on Copper Miniatures of 17th and 18th centuries

Published online by Cambridge University Press:  13 September 2016

Alfredina Veiga ,
Dora Martins Teixeira ,
António J. Candeias ,
José Mirão ,
Paulo Simões Rodrigues  and
Jorge Ginja Teixeira
Alfredina Veiga
Affiliation:
Laboratório HERCULES, Universidade de Évora, Palácio do Vimioso, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal Departamento de Química, Escola de Ciências e Tecnologia, Colégio Luís António Verney, Universidade de Évora, R. Romão Ramalho, 59, 7000-671 Évora, Portugal
Dora Martins Teixeira
Affiliation:
Laboratório HERCULES, Universidade de Évora, Palácio do Vimioso, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal Departamento de Química, Escola de Ciências e Tecnologia, Colégio Luís António Verney, Universidade de Évora, R. Romão Ramalho, 59, 7000-671 Évora, Portugal
António J. Candeias
Affiliation:
Laboratório HERCULES, Universidade de Évora, Palácio do Vimioso, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal Departamento de Química, Escola de Ciências e Tecnologia, Colégio Luís António Verney, Universidade de Évora, R. Romão Ramalho, 59, 7000-671 Évora, Portugal
José Mirão
Affiliation:
Laboratório HERCULES, Universidade de Évora, Palácio do Vimioso, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal Departamento de Geociências, Escola de Ciências e Tecnologia, Colégio Luís António Verney, Universidade de Évora, R. Romão Ramalho, 59, 7000-671 Évora, Portugal
Paulo Simões Rodrigues
Affiliation:
Departamento de História, Escola de Ciências Sociais, Colégio do Espírito Santo, Universidade de Évora, Largo dos Colegiais, 2, 7000-803 Évora, Portugal Centro de História de Arte e Investigação Artística (CHAIA), Universidade de Évora, Palácio do Vimioso, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal
Jorge Ginja Teixeira*
Affiliation:
Laboratório HERCULES, Universidade de Évora, Palácio do Vimioso, Largo Marquês de Marialva, 8, 7000-809 Évora, Portugal Departamento de Química, Escola de Ciências e Tecnologia, Colégio Luís António Verney, Universidade de Évora, R. Romão Ramalho, 59, 7000-671 Évora, Portugal
*
*Corresponding author.jmgt@uevora.pt
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Abstract

A corrosion product rarely reported in the literature has been found on the copper support of three miniature paintings of the 17th and 18th centuries. This product, which has been identified as dicoppertrihydroxyformate (Cu2(OH)3HCOO), is an unusual basic copper formate found on copper artifacts. The identification and characterization of dicoppertrihydroxyformate was carried out directly over the corroded surface of the objects, using a nondestructive approach, which combines the integrated use of various microanalytical techniques. Using this approach, it was possible to obtain a set of new reference data about the natural form of Cu2(OH)3HCOO, that will enable its unambiguous identification in other similar objects. In this work, the probable causes that may have contributed to its formation are also discussed.

Keywords

corrosion productdicoppertrihydroxyformatecopper artworkmuseum’s environmentμ-XRD
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 22 , Issue 5 , October 2016 , pp. 1007 - 1017
Copyright
© Microscopy Society of America 2016 

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