English Muffle was originally produced by Chance Brothers in England until they went out of business in the 1930s. In the 1980s Peter Foster, an insurance executive from Adelaide, Australia, was looking for a hobby in anticipation of retirement. He settled on restoring lead lights and stained glass windows and along this path he run into some challenges.
Peter found out that there was a tremendous amount of the original English Muffle glass (produced by Chance Brothers) in his restoration projects. At first he was able to find some of the needed glass at the salvage yards. This source did not last very long and he had to find the glass somewhere else.