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
![Graph. Ca-Al relations](../imgfull/102_f06a_velde_cao_al2o3.gif)
![Graph. Ca-Al relations](../imgfull/102_f06b_velde_cao_al2o3.gif)
Figure 6. CaO - Al2O3 relations for workshop samples and urban finds.
CaO-Al2O3 relations for workshops cited in text and urban finds compared to a large selection of Roman glass find compositions (references as in Figure 2).