For more on Torcello and its glassmaking industry, see Lech Leciejewicz, “How to Date the Glass-Making Workshop in Torcello?,” Archaeologia Polona: Journal of Archaeology, v. 45, 2007, pp. 99–104, online at www.iaepan.edu.pl/archaeologia-polona/article/717 (accessed July 24, 2015).