Dariz, Petra; Schmid, Thomas (2022). Raman focal point on Roman Egyptian blue elucidates disordered cuprorivaite, green glass phase and trace compounds Scientific Reports, 12(1), pp. 1-12. Nature Publishing Group 10.1038/s41598-022-19923-w
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The discussed comparative analyses of Roman Imperial pigment balls and fragmentary murals unearthed in the ancient cities of Aventicum and Augusta Raurica (Switzerland) by means of Raman microspectroscopy pertain to a predecessor study on trace compounds in Early Medieval Egyptian blue (St. Peter, Gratsch, South Tyrol, Northern Italy). The plethora of newly detected associated minerals of the raw materials surviving the synthesis procedure validate the use of quartz sand matching the composition of sediments transported by the Volturno river into the Gulf of Gaeta (Campania, Southern Italy) with a roasted sulphidic copper ore and a mixed-alkaline plant ash as fluxing agent. Thus, the results corroborate a monopolised pigment production site located in the northern Phlegrean Fields persisting over the first centuries A.D., this in line with statements of the antique Roman writers Vitruvius and Pliny the Elder and recent archaeological evidences. Beyond that, Raman spectra reveal through gradual peak shifts and changes of band width locally divergent process conditions and compositional inhomogeneities provoking crystal lattice disorder in the chromophoric cuprorivaite as well as the formation of a copper-bearing green glass phase, the latter probably in dependency of the concentration of alkali flux, notwithstanding that otherwise solid-state reactions predominate the synthesis.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
Bern Academy of the Arts Bern Academy of the Arts > Institute Materiality in Art and Culture Bern Academy of the Arts > Institute Materiality in Art and Culture > Technology in Art and Culture |
Name: |
Dariz, Petra and Schmid, Thomas |
Subjects: |
N Fine Arts > NA Architecture N Fine Arts > ND Painting N Fine Arts > NK Decorative arts Applied arts Decoration and ornament Q Science > QD Chemistry Q Science > QE Geology |
ISSN: |
2045-2322 |
Publisher: |
Nature Publishing Group |
Funders: |
[UNSPECIFIED] Goethe-Stiftung für Kunst und Wissenschaft ; [UNSPECIFIED] UBS Kulturstiftung |
Language: |
English |
Submitter: |
Petra Dariz |
Date Deposited: |
20 Sep 2022 14:17 |
Last Modified: |
20 Sep 2022 14:17 |
Publisher DOI: |
10.1038/s41598-022-19923-w |
ARBOR DOI: |
10.24451/arbor.17722 |
URI: |
https://arbor.bfh.ch/id/eprint/17722 |
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