Fig. 9From: Islamic copper-based metal artefacts from the Garb al-Andalus. A multidisciplinary approach on the Alcáçova of Mārtulah (Mértola, South of Portugal)Histograms showing the concentration of tin (A) and zinc (B) within copper artefacts. Bivariate scatterplot displaying tin versus zinc content in copper objects (C). Histogram showing the total of impurities of the Mértola copper artefacts (D)Back to article page