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There are three sources that concern the story of the “flexible” glass of first century Rome: Pliny’s Natural History, Petronius’ Satyricon, and Dio Cassius’ Roman History. Petronius (d. 63 A.D.) published the story before Pliny, who completed his encyclopedia in 78 A.D. Dio Cassius’ story is much
Until about 50 B.C. glass objects could only be made slowly due to the limited techniques available. One bottle could take several days to make via casting or cutting techniques. Core-formed objects may have taken 45 minutes to create. Glass furnace technology was such that only small amounts of