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A set of 35 samples from the rose window of the Siena Cathedral (Tuscany, Italy) has been studied using EMPA to define the chemical composition (17 major and minor elements) of the base glass. This paper focuses on colourless and natural-coloured glasses, i.e. glass produced without the intentional addition of colouring agents. The presence of natural impurities of Fe and Mn, as well as the control...
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