Kokomo Opalescent Glass (KOG) is a manufacturer of stained glass located in Kokomo, Indiana that offers an online tour of its glass factory. KOG produces art sheet glass, blown glass products, and other glassworking materials for architecture and decoration. The online tour provides photos from the hot and cold glass shops that show the glassmaking machinery, annealing ovens, color mixing, and other production processes. KOG has been in continuous operation in Kokomo since 1888.