Fig. 5
Reflection light microscope polished section of 9th-century lead-glazed Pottery. a general view of the section showing the convex bottom of the pottery. The dark vugs are remains of charcoal; inset b detail of the external margin. Note the irregular thickness of the glaze due to the penetration into the ceramic mixture when it was still plastic; inset c detail of the inner margin of the pottery showing rounded quartzite clast, white feldspar cleavage fragments, and grey quartz fragments. The orange colour suggests oxidation dues to the contact with oxygen during the ceramic firing; d grayscale BSE. Image mapping (SEM-EDAX) shows the different chemical composition of the Pottery is marked by white lead glaze and grey vesicular clay pottery with Christal's of quartz and K-feldspar; e combined elements distribution in false colours of investigation area of the sample; Pb (f), Si (g), Al (h) distribution in the sample.