In the 1st century BC, the methods of glass production underwent a revolutionary change. It was discovered that by greatly increasing the temperature of the furnaces the molten mixture became viscous enough to blow. This led to the production of both free-blown and mould-blown vessels, the latter taking on a vast variety of forms, often with raised decoration in complex designs.
ProvenanceJ. Mazard, France, The Bahamas and USA; acquired 1980s
Compare Anastassios Antonaras, Fire and Sand; Ancient Glass in the Princeton University Art Museum (Princeton, 2012) p.220-221, nos.343-345