The graal process begins with the creation of a glass blank with two or more layers of different colored glass. As with cameo glass, once cooled the out layer(s) are engraved (or sandblasted) to create design elements. Unlike cameo glass, graal glass is then reheated, cased with transparent glass and then often blown into its final shape.
The name graal comes from the French word for "grail" (sacred chalice).
