Purpose: For the artist to make his own medium and as an ingredient for a paint formula. Composition: Linseed oil, siccatives • Increases the gloss and reduces the drying time of the paint film • Increases the risk of the paint film wrinkling • Shows strong yellowing in dark conditions, which largely disappears in daylight • Not to be used as medium in lower layers • Can be thinned with white spirit or turpentine • Is darker in colour than the other linseed oils