Glass has been produced in the Bavarian Forest since the 14th century. The raw materials wood and quartz sand were available in quantities from the very beginning, while lime and, to a limited extent, colored glass clay were brought in from outside, as well as clay for the melting pots - these are the large vessels in which the glass batch is melted in the furnace at temperatures of well over 1,000 °C to this day. When it is cooled down to 1,250 °C, the glass mass reaches a viscous state and can only be processed further in this way at the glassmaker's pipe. The Eisch glassworks in Frauenau still uses its own starting mixture today. The company was founded by Valentin Eisch, a master engraver by trade, initially as a finishing company. That was in 1946; the company's own glass furnace could be put into operation just six years later. At that time, the family business was considered the youngest and smallest glassworks in Bavaria - today, Eisch exports its glassware to more than 60 countries around the world. The family's ancestors in the area were already associated with the craft of glassmaking in the 17th century.