An extended set of 18th century glass vessels was analyzed by means of SEM-EDX (major and minor element
composition) The fragmented archaeological objects were recovered from a latrine belonging to the early 18th
century building phase of the nunnery of Clairefontaine, near Arlon (B). On the basis of typology and
decoration, the major part of the vessels could be dated around the middle of the 18th century. Variety in color
and weathering of the glass suggest differences in glassmaking recipes and in the composition and origin of raw
materials. The results of the analysis show how two main compositional groups constitute about 90% of the
analyzed glass set, and these are constituted by potash glass (transparent beakers) and high lime low alkali glass
(green bottles). Next to these, a few potash-lime and soda glasses are also found. The type of alteration has also a
clear relation with the original glass composition.
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