| Full text | |
| Author(s): |
Puglieri, Thiago S.
[1]
;
Lavezzo, Ariane S.
[2]
;
dos Santos, Isabela F. S.
[1]
;
de Faria, Dalva L. A.
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Sao Paulo, Inst Quim, Ave Prof Lineu Prestes 748, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil
[2] Univ Sao Paulo, Museu Arte Contemporanea, Rua Reitoria 160, Cidade Univ, BR-05508050 Sao Paulo, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY; v. 159, p. 117-122, APR 15 2016. |
| Web of Science Citations: | 2 |
| Abstract | |
A whitish crystalline-like coating was observed on the surface of the painting ``Incendio{''}, 1990, produced by Emmanuel Nassar and awarded at the 6th Biennial of Cuenca. This work belongs,to the Contemporary Art Museum of the University of Sao Paulo (MAC-USP) and such coating modified the artwork characteristics, causing an unpleasant effect and compromising its exhibition. The choice of the proper conservation and restoration strategies involves the understanding of the degradation process, demanding the identification of the chemical compounds formed on the painting surface, as well as of the other components in the painting. The results here obtained from Raman and optical microscopies, FTIR-ATR, SEM-EDS and GC-MS, revealed that the efflorescence chemical composition is almost only palmitic acid, with minor contents of stearic acid and their methyl esters, and that the paints are composed by chrome yellow, amorphous carbon and toluidine red pigment; an aluminum silicate filler in the black paint applied on the aluminum ground was also detected. Hierarchical Cluster Analyses (HCA) of the Raman spectra also revealed that the concentration of the efflorescence minor components depends on the paint composition. It was suggested, therefore, that the degradation process resulted from segregation and migration of mainly palmitic add from the dried paints. Restoration methodologies used in similar cases, as well as factors that contribute to this process, were discussed. (C) 2016 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 12/13119-3 - Vibrational spectroscopy in condensed phases |
| Grantee: | Mauro Carlos Costa Ribeiro |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 11/13760-8 - Impact of microenvironment chemical composition on heritage objects: mechanisms and monitoring |
| Grantee: | Thiago Sevilhano Puglieri |
| Support Opportunities: | Scholarships in Brazil - Doctorate |