Originally discovered by the Tiffany Studios in the early 20th century, Ring Mottles are a special effect of localised, heat-treated opacification and crystal-growth dynamics. Louis Comfort Tiffany was searching for glass containing realistic natural effects to express his representational imagery with minimal use of painting. He couldn't have been happier than when he saw the first accidentally formed Ring Mottles and he found a myriad uses for them!