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Glass is made by melting sand,soda ash,lime,some recycled glass in a furnance at 1900 degree celsius in a liquid state it is drawn on molten lead to make the glass surface flaâ¦t and allowed to cool for 36 hours before packing.(the green colour in th glass appears due the iron content in it)
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.