Previously referred to as Michael Harding Refined Portuguese Turpentine, this Refined Gum Turpentine is a colourless solvent distilled from pine sap. It is used to thin oil paint and to clean various printmaking tools of oil-based ink. Michael Harding use this genuine Portuguese Maritime Turpentine to produce their oil mediums. It generally speeds the drying time of oil paint, and thus is especially useful for underpainting. Paints mixed with this Turpentine will dry slightly matte. Turpentine is a volatile and toxic material; please exercise due caution when using this product. Try and store in darkness, as direct sunlight causes turpentine to cloud. UK shipping by road only. Not available for International or Northern Ireland delivery.