I've got a thing about core forming it really fascinates me.... :pb:
Some of the glass beads are stunning, decorated with faces and the like. You would have had to be seriously wealthy and/or powerful to own and use one of those core formed vessels about 5000 years ago. Objects were made with moulds too, either cast or pressed.
Once the Romans got into glass (and glassblowing) they produced bottles etc. on an industrial scale at various locations, much of this 'everyday' glass was decorated in some way too. The Roman Empire was a trading empire, you need to keep your fish sauce fresh if you want to sell it thousands of miles away and glass was the best substance for making vessels to do this (it is non porous).
John