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Based on the stretching of glass
Glassblowing is based on the stretching property of glass, probably discovered by the Syrians in the 1st century BC. It consists of transforming a mass of molten glass, called a parison, into a bubble and then into a hollow shape. The blowing of this bubble inside a mold allows accelerating the reproduction of the chosen shape. Glassblowing hence constitutes a practical and useful technique given the rapidity of glass cooling.
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