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This article is within the scope of WikiProject Visual arts, a collaborative effort to improve the coverage of visual arts on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.
I move the slab glass info from the article to this talk page. Perhaps it would be good to create an article named slab glass, which is a red link in the stained glass article. Then, add the Slab glass link to the place where it's covered in the article.
In the 1890s slab glass became the favourite raw material of the Arts & Crafts stained glass world. Edward S Prior was its champion and it was first used in 1888 by Britten & Gilson at Prior's instigation. To make slab glass, molten glass was blown into a box-shaped mould and when hardened the glass was removed and the resultant glass box could be cut into four rectangular slabs taken from each side of the box and one square from the base. Due to the glass being blown into the mould at a late stage, the glass in the corners and around the edges of the flat sides of the box is thinner than that in the centre of each side. Thus the colour of the glass in the centre of each "slab" is much denser than that on the edges. Ít should also be noted that the surface of the glass is uneven. A variant was "Norman" slab made by the Birmingham Company Chance but the differences were small. Slab glass was to become the hallmark of Arts & Crafts stained glass.