Fig. 11From: Islamic copper-based metal artefacts from the Garb al-Andalus. A multidisciplinary approach on the Alcáçova of Mārtulah (Mértola, South of Portugal)Stacked columns with the main impurities detected in the 171 artefacts analysed from Mértola, showing differences in the concentration of each element and in the total amount (A). Boxplot displaying the variability of impurities in brass artefacts (B) and the rest of alloys (C)Back to article page