“…Deep blue glass colored with a cobalt-blue colorant has been identified in some of the earliest known Egyptian glasses (Lilyquist and Brill, 1993) and its use became common and mass-produced at the glass workshops in Malkata (early 14th century BC) and Amarna (mid-14th century BC). Egyptian cobalt-blue glass was exported to the Mediterranean region (Walton et al, 2009;Jackson and Nicholson, 2010;Polikreti et al, 2011). In addition, at these sites, cobalt-blue colorants were commonly used in making blue faience (Lucas and Harris, 1962;Kaczmarczyk and Hedges, 1983;Tite and Shortland, 2003).…”