Fig. 7.

BSE micrographs of the opaque glazes analysed with picture of the respective sherd showing: a) the abundant presence of cassiterite crystals as opacifiers (Chi 30); b) the use of tin opacifier in a frit-like glaze showing numerous unmelted quartz grains in the glaze (Chi 6); c) the presence of large bubbles, unmelted quartz and overglaze brown decoration with associated kentrolite crystal near the surface of the glaze in sample Chi 28. This sample was likely opacified using quartz rather than tin oxide