Graal glass
Orrefors' technique in which the pattern lies inside the glass, under a layer of clear glass.
The Graal technique was developed at Orrefors glassworks in 1916 by the glassblower Knut Bergqvist together with the artist Simon Gate. The name refers to the Holy Grail.
The technique was developed further by Edward Hald and later Edvin Öhrström and Vicke Lindstrand, who also developed Ariel, with air trapped in the glass. It made Swedish art glass known around the world.
Materials: Coloured and clear glass
Manufacture: A small piece of cased glass is cut or etched, reheated and blown out with a new layer of clear glass on top.
The pattern lies within the body and cannot be felt with a finger.
Soft, slightly blurred outlines where the pattern has been blown out.
Signature under the foot with Orrefors, Graal, a number and the artist's name.