Glass can be manufactured by melting a mixture of silica (silicon oxide), sodium carbonate, dolomite (CaMg(CO3)2) and limestone (CaCO3) at a high temperature, up to 1600 °C. The mixture is then cooled to solidify without crystallization. The nonliquid and nonsolid state makes glass to be an amorphous solid material. Special additives are used to give glasses their colors and specific properties [[5], [6] and [7]].