Graal was the name given to a glass overlay technique, developed by Orrefors glassworks in Sweden.
A glass bubble is encased with a coloured layer of glass (an overlay). When cold, it’s surface is engraved or sandblasted. This bubble or ‘embryo’ is then slowly reheated and covered with a gather of clear glass before blown into the final shape. The result has a painterly quality and a softness of line.
Examples of work are in the collections of the National Museum of Scotland, Edinburgh, V&A Museum, London and Kelvingrove Museum & Art Gallery, Glasgow amongst others.