Circa 100-300 AD A well blown ancient Roman green glass bowl, featuring a bulbous globular body tapering to the rim. The internal area of the glass bowl is decorated with ribbing. Glass bowls with ribbed decoration have been manufactured since the Hellenistic period, from the 1st century BC into the first few decades of the 1st century AD. This bowl would have been crafted by blowing a bubble of glass into a mould, creating the ribs on the vessel’s external surface and leaving extremely thin areas between the ribs. By the time of the end of the 1st century AD manufacturing became large scale, which allowed glass to bemonly available material in the Roman world. For similar see: Roman Glass in the Corning Museum Volume 1-3. For further reading on Roman glass: Bergman, S.; Ancient Glass, Carnegie Museum of Natural History, Pittsburgh. Bianchi, Robert S.; Reflections on Ancient Glass, from the Borowski collection. Size: L:70mm / W:154mm; 130g Provenance: Private London collection; acquired in the 1990s on the UK art market.