Birchwood Casey Walnut Oil. Water soluble stains are sun-fast, true to colour and non-bleeding. Produces a clear, rich colour without grain clouding or smearing. Highlights the grain and enhances the natural beauty of wood. Walnut Stain is a true, brown-walnut colour for the traditional look. Colour intensity is easily controlled by adding water to concentrate or using full strength for light coloured woods. 3 fl oz.