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 & 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, & thus is especially useful for underpainting. Paints mixed with this Turpentine will dry slightly matte. Turpentine is a volatile & toxic material; please exercise due caution when using this product. Try & store in darkness, as direct sunlight causes turpentine to cloud. UK shipping by road only. Not available for International or Northern Ireland delivery.