Slag glass is the name used for opaque
colored glass with white and/or cream streaks. There are many colors of slag glass,
but the most common is a light brown color called caramel. Both flat and
curved slag glass panels fit into a metal frame and held in with different kinds
of slots and clips. Occasionally, a base will also have slag glass panels and fancier
styles had a metal design overlay on top of the glass. Slag glass lamps were extremely
popular from the early 1900's until World War II.