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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.