ALWAYS WEAR GLOVES WHEN HANDLING ROUGH GLASS! Historical Clear and Aqua Colored Slag glass from Pittsburgh, PA. UNTREATED ROUGH PIECES make a beautiful decoration for your garden or aquarium, maybe an office. They could also be used as Lapidary and Made into jewelry or something else. The specific Pittsburgh Plate Glass Co. plant that these items are from opened in 1887 along the Allegheny River in Ford City, PA. It actually turned the town into a boom town for quite some time. These pieces came from a man who worked in that plant in the 1940s.  PPG has an extensive history in the United States. If you buy this piece, you're buying a piece of history. PIECES IN PHOTOS ARE PIECES THAT SHIP!