5 documents found, page 1 of 1
Application of a handheld Raman spectrometer for the screening of colored secon...
Košek, F; Culka, A; Fornasini, L; Vandenabeele, P; Rousaki, A; Mirão, J; Bersani, D; Candeias, A; Jehlička, JThe São Domingos area (Corte do Pinto, Portugal) represents a large sulfide ore deposit in the Iberian Pyrite Belt that was mined primarily for copper and sulfur in the past. Currently, the deserted mine and mine wastes are the reason for the production of acid mining drainage releasing potentially harmful elements. Because metastable secondary sulfates may temporary sink toxic pollutants, the in situ monitorin...
Multi-analytical study of ceramic pigments application in the study of Iron Age...
Rosado, L; Van Pevenage, J; Vandenabeele, P; Candeias, A; Conceição Lopes, M; Tavares, D; Alfenim, R; Schiavon, N; Mirão, JA non-invasive multi-analytical approach combining optical microscopy (OM), micro-X-ray diffraction (mXRD), in-situ X-ray fluorescence spectroscopy (XRF), variable pressure scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (VP-SEM-EDS) and Raman micro-spectroscopy has been employed for the first time to investigate the chemical composition of ceramic pigments in Iberian Iron Age cer...
Micro-Raman spectroscopy and complementary techniques (hXRF, VP-SEM-EDS, μ-FTIR...
Coccato, A; Costa, Mafalda; Rousaki, A; Clist, B; Karklins, K; Bostoen, K; Manhita, A; Cardoso, A; Dias, CB; Candeias, A; Moens, L; Mirao, JIn the framework of the inter-disciplinary KongoKing project, a set of beads from archaeological excavations in the Democratic Republic of the Congo was analysed by means of a minimally invasive, multi-analytical approach based on micro-Raman spectroscopy. The full characterization of the materials, including glassy network, opacifiers and colorizers, was achieved thanks to the combination of data from handheld...
Evaluation of portable Raman spectroscopy and handheld X-ray fluorescence analy...
Lauwers, D; Candeias, A; Coccato, A; Mirão, J; Moens, L; Vandenabeele, PIn archaeometry, the advantages of a combined use of Raman spectroscopy and X-ray fluorescence spectroscopy are extensively discussed for applications such as the analysis of paintings, manuscripts, pottery, etc. Here, we demonstrate for the first time the advantage of using both techniques for analysing glyptics. These engraved gemstones or glass materials were originally used as stamps, to identify the owner,...
Pink! Why not? On the unusual colour of Évora Cathedral
Rosado, T; Reis, A; Mirao, J; Candeias, A; Vandenabeele, P; Caldeira, A TThe inner walls of the Evora Cathedral have a pink/orange hue of unknown origin that covers the majority of the surface. In this work, an integrated approach was envisaged to explore whether the walls pink colour is due to anthropic intention or to natural sources, by combining material characterisation of the surface layers with its microbiological study. Mortars material characterisation showed no presence of...