Figure 47

SEM images of melted potassium and sodium salt grains. (a), (b) Potassium chloride (KCl) grains melted into the surface of the palace mudbrick meltglass. (c) Melted NaCl and KCl grains. Bubbles at arrows suggest the salt grains exceeded their melting points. (d) Manually constructed EDS-based phase map of panel ‘c’, showing potassium chloride (KCl; green), sodium chloride (NaCl; blue), and spindle-like calcium carbonate crystals (CaCO3; purple).