Last Updated: Jul 19, 2016 Views: 141
Slag glass refers to opaque, marbled glass. According to the glass dictionary online, "The name derives from the belief that these colours were achieved by adding "slag" from iron smelting works to the glass." Wright, on the other hand, in the Cedar Rock building, used waste glass, leftover from the furnace, which would be different from slag glass. I am attaching a bibliography on slag glass, in case you would like to do some additional research on this glass.