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Of the many silica-based glasses that exist, ordinary glazing and container glass is formed from a specific type called soda-lime glass, composed of approximately 75% silicon dioxide (SiO 2), sodium oxide (Na 2 O) from sodium carbonate (Na 2 CO 3), calcium oxide, also called lime (CaO), and several minor additives.
A core is made of clay mixed with sand, to which have been added organic materials such as straw, grass, leaves or seeds. This core is mounted on a metal rod, and the glassmaker wraps it in hot semi-molten glass drawn into a thread. The glassware thus produced is decorated by the addition of glass threads of different colors, which are formed into zigzags, as here, or into garlands. Once the glass is cool, the clay core is discarded.