A pale, thick, concentrated form of linseed oil. Stand oil is prepared by anaerobically heating linseed oil to about 3008C. This allows the oil to partially polymerise without any oxidation occurring. Anaerobic conditions are obtained using a vacuum or carbon dioxide atmosphere. Stand oil was likely developed by the Dutch in the 19th century. Stand oil dries more slowly and yellows less than untreated linseed oil. It forms a tough, flexible film that is resistant to weathering. Stand oils have been used in varnishes, glazes and as a high viscosity additive to other paint media. Half oil is half stand oil and half oil of turpentine. Synonyms: English oil varnish; Standöle (Ger.); half oil; standoil. Museum of Fine Arts, Boston (2000). [J. Cassar, R. de Angelis]