Substitute Material for Damaged/ Missing Glass Panels
If replacement glass cannot be found to replace broken or missing panels, a compatible substitute material may be considered if it conveys the same visual appearance as the historic material, i.e., color, size, and reflectivity.
Two of the historic producers of pigmented structural glass now manufacture a similar product known generically as "spandrel glass" and marketed under the trade names of Spandrelite and Vitrolux. This heavy plate glass has a ceramic frit or colored ceramic surface fired to the back of the glass. Stock colors are available in a range of grays, browns, bronzes, and black. Custom colors are also available.