RT Journal Article
T1 Study of a late bronze age casting mould and its black residue by 3D imaging, pXRF, SEM-EDS, micro-FTIR and micro-raman
A1 Figueiredo, Elin
A1 Bottaini, Carlo
A1 Miguel, Catarina
A1 Lackinger , Aarón
A1 Mirão, José
A1 Comendador Rey, Beatriz Pilar
K1 5505.01 Arqueología
K1 5504.05 Prehistoria
AB In the present work, a fragment of a stone mould recently found in Galicia (NW Spain) was studied by multiple analytical techniques approach involving 3D optical imaging reconstruction to obtain data about the shape of the mould, typology of artefact produced, and distribution of a black residue at the surface of the mould and pXRF, SEM-EDS, micro-FTIR, and micro-Raman to investigate the nature of the black residue. The study shows that the mould was likely used for socketed axes with a side loop, was originally composed of two valves and one core, and that it might have been subjected to a repair during use. The black residue is distributed in the carved surface and spreads to nearby surfaces as a result of the use of the mould. The alloy cast in the mould was a ternary bronze (Cu + Sn + Pb). The analyses by SEM-EDS of black residue covering the surface did show the presence of scattered micro particles with P and Ca, and micro-Raman analysis detected the presence of a carbon black of animal source, while micro-FTIR analysis detected remains of proteins, oxalates, and hydroxyapatite. These results are amongst the very few studies made on black residues of ancient moulds and suggest that the mould was dressed with a carbon black of animal origin, such as burned bones, prior to metal casting, probably used as a coating agent to improve the casting and artefact recovery.
PB Heritage
SN 25719408
YR 2021
FD 2021-09-30
LK http://hdl.handle.net/11093/2843
UL http://hdl.handle.net/11093/2843
LA eng
NO Heritage, 4(4): 2960-2972 (2021)
NO Fundação para a Ciência e a Tecnologia | Ref. PTDC/HAR-ARQ/32290/2017
DS Investigo
RD 17-mar-2025