We may think of glass as being produced by the mixture of some very special chemicals in a very special way, a sort of miracle of chemistry. But actually, glass is made by a rather simple process using quite ordinary materials. Glass is a substance made by “fusing”(melting together) certain materials, and then cooling the mixture so that the atoms arrange themselves in an unorganized pattern. What materials? Well, about 95 per cent of the raw materials in the earth could be used in making glass! The most important materials used in making glass, however, are: sand (silica), soda, limestone, borax, boric acid, magnesium oxide, and lead oxide.