Identification of red colorants in van Gogh paintings and ancient Andean textiles by microspectrofluorimetry |
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| Authors: | Ana Claro Maria J Melo JSérgio Seixas de Melo Klaas Jan van den Berg Aviva Burnstock Meredith Montague Richard Newman |
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| Institution: | 1. REQUIMTE-CQFB, Faculty of Sciences and Technology, New University of Lisbon, Campus da Caparica, 2829-516 Monte da Caparica, Portugal;2. Department of Conservation and Restoration, New University of Lisbon, Campus da Caparica, Monte da Caparica, Portugal;3. Department of Chemistry, University of Coimbra, Coimbra, Portugal;4. ICN-Instituut Collectie Nederland, Netherlands Institute for Cultural Heritage, P.O. box 76709, Amsterdam, Netherlands;5. Department of Conservation and Technology, Courtauld Institute of Art, Somerset House, London WC2R ORN, UK;6. Department of Conservation and Collections Management, Museum of Fine Arts, 465 Huntington Avenue, Boston, MA 02115-5597, USA |
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| Abstract: | Red lake pigments and dyes used in works of art were characterized by microspectrofluorimetry, a new tool in the field of cultural heritage. Emission and excitation spectra were obtained with high spatial resolution (8–30 μm) in cross-sections from paintings by Vincent van Gogh and Lucien Pissarro and from millenary Andean textiles. The fluorophores were identified by comparing their spectra with those from historic reconstructions assembled in a database. In the paints, purpurin and eosin lakes were detected. In the Paracas and Nasca textiles, dated from 200 B.C. to A.D.1476, purpurin and pseudopurpurin were the red dyes used. Carminic acid was detected in textiles dated close to the Inca Empire, A.D. 1000–1476. The results obtained with this new technique were confirmed and are in agreement with those obtained with conventional methods, requiring microsampling, such as HPLC-DAD-MS and SEM-EDX. |
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