The history of glass making before the Industrial Revolution can be separated in two stages: in the first, which began in the 3rd millennium BCE and ended in the period from 100 to 50 BCE, craftsmen discovered how to transform raw materials into glass and how to make vessels and other objects either with moulds or by forming a molten glass around a removable core. Both techniques were labour-intensive and were seldom made in big quantities. In the second stage, beginning in the 1st century CE in the Syro-Palestinian region, glass workers found that molten glass could be formed by inflation and manipulation with tools. Glass blowing enabled them to make quickly a wide range of shapes, thus widening its market.However, after the 2nd century CE, glass is generally found in a more confined area. The change appears to have taken place under the Flavian Emperors (69-96 CE), an era that in many ways represents a watershed in the history of glass making. It is from this time onwards that glassblowing in the East and the West developed along independent lines, the only exception being fine tableware decorated with special techniques, which was probably due to the still unifying factor of the Roman Imperial administration.