Scientific investigations on the history of glass indicate that the early men living near the volcanoes discovered the raw material of the glass at locations where the molten rocks went cold swiftly. Using the glass, they embarked on making sharp items such as arrows, knife blades, and other practical tools. They finally got engaged in creating decorated items of glass. Looking at the history of glass working, one could identify three historical periods in terms of formulation and raw materials used for soda-lime-silica glass as follows: