Fig. 10: Decolourisation process at Tell Iẓṭabba.
From: The Hellenistic - Roman transition in glass technology: insights from Nysa-Scythopolis
A. Tell Iẓṭabba samples are ranked by manganese oxide content and labelled according to colour. B. Manganese oxide versus antimony showing that how manganese has led to amber-yellowish, bluish and greenish colours for the Tell Iẓṭabba glasses, while it is only the combination of antimony and manganese that led to colourless appearances. Only exception is colourless sample Tell Iz-25 with highly elevated MnO = 1.22 wt% and no Sb. White squares = colourless, blue circles = bluish, green circles = greenish and yellow triangles = yellowish/amber samples. C. A closer look at Sb versus MnO shows the dramatic difference in ‘colour’ for samples Tell Iz-18 (greenish) and Tell Iz-17 (colourless) with near-identical MnO and FeO concentrations of 0.85 wt% and ~ 0.3 wt%, but different Sb concentrations of 7 ppm and 436 ppm, respectively.
