Purpose: to dilute oil colours and clean brushes and other materials. Composition: Portuguese gum turpentine (obtained by distilling pine resin essences • Makes oil colours lean (for use on undercoats) • Makes brushstrokes disappear • Can be used to remove dry layers of varnish • Suitable for dissolving (natural) resins • Also suitable for dissolving mediums and varnishes for oil paints • Flammable