Egyptian blue
Archaeological Evidence for Glassworking, Guidelines for Recovering, Analysing and Interpreting Evidence, published by Historic England in 2018, defines Egyptian blue as: ‘A pigment that predates glass and is a striking bright blue. In Britain it is more common from Roman sites. It is made from crushed quartz or sand, mixed with alkali fluxes and a copper colourant, which is then fired. It is not completely glassy and contains many cuprorivaite crystals, which cause the colour.’
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