Bruce Velde, Directeur de Recherche Emérite CNRS, Laboratoire de Géologie, CNRS UMR 2385 – ENS (École normale supérieure) Paris (France)

Roman blown glass compositions:
following supply patterns in the manufacturing chain

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Figure 2. Na versus Ca content fusing agent versus sand content.
2a) Roman-east France and Wadi Natron
2b) Embiez and east France

Figure 2a. Na2O (weight percent) versus CaO content showing variations in fusing agent versus sand content for a sample of Roman glass finds from three cities (diamonds) data from Velde (1990); Velde and Sennequier (1985); Aerts et al. (2003); Aerts et al. (2000) and Davidson Weinberg (1988) and the eastern France samples. Squares show compositions from the Eastern Freanc finds (table 1).

Figure 2b. Embiez shipwreck raw glass data (Foy et al., 2006) and eastern France samples.