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Carafe-like bottles like this one and its many variations were made in great numbers in the third and fourth centuries. Although the initial glassblowing process requires much skill, the last step—creating the final rim—does not. The video shows three different cracking-off processes. In Jerusalem, sometime about 40 B.C., it was discovered that molten glass could be inflated. To make this phenomenon useful and practical, manufacturing processes had to be invented. This occurred during a rapid expansion of the Roman Empire that eventually included the entire Mediterranean Basin and extended to the far eastern coast: present-day Israel. Through an extensive trade of goods and the widespread movement of people and know-how, glassblowing found its way to the Italian peninsula. It took root and developed quickly. Glassblowing spread to become—then, as now—the predominant method of making glass vessels. Learn more at https://romanglassblowing.cmog.org. The resource is a follow-up to Gudenrath's popular Techniques of Renaissance Venetian Glassworking (https://renvenetian.cmog.org) and Technique of Renaissance Venetian-Style Glassworking (https://renvenetianstyle.cmog.org/)