Barilla
Archaeological Evidence for Glassworking, Guidelines for Recovering, Analysing and Interpreting Evidence, published by Historic England in 2018, defines ‘barilla’ as: ‘A term for the ashes of halophytic (salttolerant) plants, which provided a fairly pure source of sodium oxide flux. Prized for making high-quality glass, large amounts were imported from Spain in the 18th and 19th centuries.'
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