"Making glass is a hot business, both literally and figuratively. The factory has 12 brick furnaces that use natural gas to heat the limestone, soda ash and sand to 2,200°F (1,200°C). Different mixtures of ingredients create the distinct Wissmach colors. After heating, workers scoop the molten glass from the furnace and wheel it over to the glass press where a roller presses it into one of the 18 patterns that the company produces. " WISSMACH GLASS