Michael Harding Refined Linseed Oil is a pale oil extracted from the seeds of the flax plant. It is used in many of Michael Harding's paints because it produces the strongest paint film during the drying process and ensures the longevity of each painting. When mixed with oil paint, linseed oil will increase the gloss and transparency of the paint, and will thin the paint so that it flows more easily and does not hold brushmarks. It will also slow the drying time of the paint. Linseed oil is also highly suitable for use with dry ground pigments. UK shipping by road only. Not available for International or Northern Ireland delivery.