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In this work, we present the results of the quantitative determination of Fe and Mn in different oxidation states, inferring a colour to the glass used in a palaeo-Christian polychrome mosaic of St. Prosdocimus in the Basilica of St. Justine (Padova). The colour in the glass is determined by the amount of the ions of the elements in different oxidation states. More than 3000 loose tesserae of this...
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