N. Welter's research while affiliated with University of Wuerzburg and other places

Publications (4)

Article
Full-text available
About 100 fragments of Roman mosaic and millefiori glass were stylistically attributed to a Hellenistic type, a Ptolemaic and Romano-Egyptian period type and an early imperial period type. Twelve representative fragments were studied by electron microprobe analysis and Raman microspectroscopy. Eleven of them display a Na-pronounced recipe with low...
Article
Ancient coloured glass beads from Sri Lanka and Oman were analysed by Raman microspectroscopy for non-destructive identification of inorganic pigments in the glass. Calcium phosphate (Ca3(PO4)2), cassiterite (SnO2), cuprite (Cu2O) and a Pb(Sn,Si)O3-type lead tin oxide were found to be used as colouring agents. Moreover, a distinction between lead-b...
Article
Mikroanalytische Untersuchungen gewinnen in der Archäometrie aus verschiedenen Gründen immer mehr an Bedeutung. Zum einen hat sich die Zahl der unterschiedlichen Methoden in den vergangenen zehn bis fünfzehn Jahren deutlich vergrößert. Neben der traditionell weit verbreiteten Elektronenstrahl-Mikrosonde stehen heute unterschiedliche Typen von Laser...
Article
Full-text available
Die Antikenabteilung des Martin von Wagner Museums in Würzburg besitzt etwa 200 Fragmente von Mosaikgläsern, die aus dem Kunsthandel stammen und von denen jetzt 100 archäologisch bearbeitet wurden [1]. Bei diesen Gläsern handelt es sich um Gefäße, Einlagen und Verkleidungs-platten, die aus einzelnen kleinen Scheibchen von vorgefer-tigten Mosaikglas...

Citations

... Since then, copper red has been found in numerous areas and various time periods. Orange and red glass beads from the 5th-1st centuries BCE have been reported in South Asia (India, Thailand, and Sri Lanka) [13][14][15], with both Cu 2 O and Cu 0 colourations. Cuprite red was also very popular in enamel work in the Celtic period (4th-1st century BCE) [16] and the early Middle Ages in Europe [17]. ...
... As already noted, turquoise glasses are opacified through Ca antimonate inclusions, often characterized by anhedral habit and minor substitutions of Ca with Na and, more frequently, low amounts of Pb (when present, it usually accounts for 2-4 wt%). This is consistent with what is reported in the literature on Ptolemaic (Bimson & Freestone, 1988) and Roman glass (Basso et al., 2014;Gedzeviči utė et al., 2009;Silvestri et al., 2014) glasses were also reported, but mainly dated to the Late Antiquity. Lead antimonate, in association with copper, is also known as the main colorant/opacifier in the few analyzed LBA opaque green glasses from Egypt (Shortland & Eremin, 2006), but has not been identified in the Tebtynis samples analyzed during this work. ...