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Abstract Micro‐Raman spectroscopy was applied to the study of some French sigillata wares dating back to the end of the 1st century AD and coming from two important Roman ceramic production centres at La Graufesenque (Aveyron) and Glanum in Saint Rémi de Provence. The differentiation between the mineralogical composition of the reddish bright slip and the porous ceramic body underneath was accomplished, confirming the previous hypothesis by the CNRS research group at Toulouse that a different and finer clay material was used for the coating. This was primarily suggested by the highly heterogeneous body matrix mineralogy due to the presence of a large variety of minerals such as haematite, quartz, rutile and feldspar species, while the slip coating was basically made of haematite alone. The phase analysis results also gave an indication of the firing for insight into the production technology: an oxidizing atmosphere and a firing range between 850 and 1000°C could be suggested, in good accordance with the acknowledged Roman sigillata pottery production procedure. Copyright © 2004 John Wiley & Sons, Ltd.
Lofrumento et al. (Fri,) studied this question.