Kokomo Opalescent Glass Co.
Where Glass is Made
For those following the Indiana Glass Trail, a good place to start is the Kokomo Opalescent Glass Co., which offers tours of its factory where workers melt soda ash, silica sand, crushed limestone, feldspar colors and minerals in clay pots that can hold about 1200 pounds of the material, cooking it for about 17 hours at temperatures of 2400 degrees Fahrenheit.
Then the glowing molten glass is shaped, first in the large factory room with the ovens, it's the same one used for over a century and then in the Hot Glass Studio where it is turned into vases, bowls, jewelry and other intricate shapes.
Louis Comfort Tiffany used KOG for much of his glass and when the Chicago Cultural Center, with the Tiffany ceiling, needed to replace some of its glass, KOG was able to find the original recipes from the 1800s and replace it.