The chemical compositions of more than 300 medieval stained glass samples of different local origin have been published. About 80% of all investigated samples proved to be potash-lime-silica glasses with roughly equal concentration of CaO and K2O (type 1). But a small group which had been taken from two churches of the Rhine region gave a ratio of CaO/K2O>2 (type 2). This paper concludes that it seems likely that a corresponding recipe was used, which was nearly unknown elsewhere in Europe.
Origin
Bundesanstalt Fur Materialforschung Und -Prufung, Berlin
Journal Title
Glastech Ber Glass Sci Technol 67 2 1994 45-48
Sector
Flat glass
Class
F 406