| http://www.w3.org/ns/prov#value | - There is, apparently, something called 'British and other Coloured Glass' by John Bedford - 1954, but have not a clue as to its usefulness.Apparently the blue was arrived at by the use of smalt - a vitreous form of cobalt oxide, which presumably was imported, but from where I do not know and, occasionally, copper was used for blue.The greens seem to vary more than the others, especially in the drink
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